- Series: Letters: L. Sprague de Camp Series Record # 43975
- Letters: L. Sprague de Camp
- Letter (Astounding Stories, September 1937): The Origin of Legends. (1937) [ES] by L. Sprague de Camp
- Letter (Astounding Stories, December 1937): The Last Word? (1937) [ES] by L. Sprague de Camp
- Letter (Astounding, September 1938): THe Poor Fish—He Shoulda Kept That Other Thumb! (1938) [ES] by L. Sprague de Camp
- Letter (Astounding, January 1939): WOuld the Moon's Fragments Reach Earth? (1939) [ES] by L. Sprague de Camp
- Letter (Astounding, February 1939): Proving Lex Pandro Even More of a Liar Than We Thought! (1939) [ES] by L. Sprague de Camp
- Letter (Amazing Stories, April 1931) (1939) [ES] by L. Sprague de Camp
- Letter (Astounding, April 1939): Hero Come to Life! (1939) [ES] by L. Sprague de Camp
- Letter (Unknown, June 1939): It sounds unpleasant to put this way (1939) [ES] by L. Sprague de Camp
- Letter (Unknown, October 1939): "Comments on Yoga" (1939) [ES] by L. Sprague de Camp
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Letter (Astounding, December 1939): "How the Monster Lost His Plumbing—"?Letter (Astounding, December 1939): "How the Monster Lost His Plumbing-"(1939) [ES] by L. Sprague de Camp
- Letter (Astounding, July 1941): A Chin Is Herewith Stuck Forth! (1941) [ES] by L. Sprague de Camp
- Letter (Unknown Worlds, April 1942) (1942) [ES] by L. Sprague de Camp [only as by Lyon Sprague de Camp]
- Letter (Astounding, May 1942): It's a Promise! (1942) [ES] by L. Sprague de Camp
- Letter (Astounding, October 1942): So That's Who Jules Got Hooked by! (1942) [ES] by L. Sprague de Camp
- Letter (Astounding, April 1944): Guess Koolos Will Never Rule the Planet! (1944) [ES] by L. Sprague de Camp
- Letter (Astounding, October 1945): I'll Bet a Goodly Number Got Incinerated for Making Predictions, Though. Wrong Predictions Annoy Potentates. (1945) [ES] by L. Sprague de Camp
- Letter (Astounding, April 1946): If Most of the Things Tried Don't Work, and the Atomic Bomb Did—Wonder What Else They Tried! (1946) [ES] by L. Sprague de Camp
- Letter (Astounding, May 1946) (1946) [ES] by L. Sprague de Camp
- Letter (Astounding, February 1947): Ouch!—Art Dept. (1947) [ES] by L. Sprague de Camp
- Letter (Astounding, March 1949): I Know, Sprague, But an Invetion Dropped Because Currently Unworkable Is Usually So Buried and FOrgotten as to Be Practically Unknown. The Athodyd Was Heard of in 1910; by 1920 It Was Unheard of! The Same Applies to Microwaves—Vide Hertz—and Waveguides! (1949) [ES] by L. Sprague de Camp
- Letter (Science-Fantasy Review, Autumn 1949) (1949) [ES] by L. Sprague de Camp
- Letter (Startling Stories, November 1950): Sometimes Silly (1950) [ES] by L. Sprague de Camp
- Letter (Astounding, February 1951) (1951) [ES] by L. Sprague de Camp
- Letter (Thrilling Wonder Stories, December 1951) (1951) [ES] by L. Sprague de Camp
- Letter (Startling Stories, January 1952) (1952) [ES] by L. Sprague de Camp
- Letter (Astounding, February 1952) (1952) [ES] by L. Sprague de Camp
- Letter (Astounding, April 1952) (1952) [ES] by L. Sprague de Camp
- Letter (Thrilling Wonder Stories, August 1952) (1952) [ES] by L. Sprague de Camp
- Letter (Startling Stories, December 1952) (1952) [ES] by L. Sprague de Camp
- Letter (Nostradamian Interlude) (1953) [ES] by L. Sprague de Camp
- Letter (Astounding, March 1953) (1953) [ES] by L. Sprague de Camp
- Letter (Thrilling Wonder Stories, August 1953) (1953) [ES] by L. Sprague de Camp
- Letter (Astounding, December 1953) (1953) [ES] by L. Sprague de Camp
- Letter (Astounding, August 1954) (1954) [ES] by L. Sprague de Camp
- Letter (Astounding, September 1954) (1954) [ES] by L. Sprague de Camp
- Letter (Astounding, October 1956) (Obituary Fletcher Pratt) (1956) [ES] by L. Sprague de Camp
- Letter (Science Fiction Stories, March 1957) (1957) [ES] by L. Sprague de Camp
- Letter (Astounding, January 1958) (1958) [ES] by L. Sprague de Camp
- Letter (Science Fiction Stories, May 1958) (1958) [ES] by L. Sprague de Camp
- Letter: On Jhil (1959) [ES] by L. Sprague de Camp
- Letter: African Swackles (1960) [ES] by L. Sprague de Camp
- Letter: On the Gnarly Man and Old Man Mulligan (1961) [ES] by L. Sprague de Camp
- Letter: On Solomon Kane (1961) [ES] by L. Sprague de Camp
- Letter (Fantastic Stories of Imagination, October 1961) (1961) [ES] by L. Sprague de Camp
- Letter: On Names (1962) [ES] by L. Sprague de Camp
- Letter: On an Anthology (1962) [ES] by L. Sprague de Camp
- Letter: On Dunsany (1962) [ES] by L. Sprague de Camp
- Letter: On a Scroll (1962) [ES] by L. Sprague de Camp
- Letter: On the Influence of Lord Dunsany on Clark Ashton Smith (1963) [ES] by L. Sprague de Camp
- Letter: On - er - Previous Letters (1963) [ES] by L. Sprague de Camp
- Letters: On Weapons of Choice &/or Necessity (1963) [ES] by L. Sprague de Camp
- Letter: On Weapons of Choice &/or Necessity [2] (1963) [ES] by L. Sprague de Camp
- Swackle (Amra V2n29, August 1964) (1964) [ES] by L. Sprague de Camp
- Letter: On Mr. Pournelle re Sword and Quarterstaff (1964) [ES] by L. Sprague de Camp
- Letter (Haunted V1n2) (1964) [ES] by L. Sprague de Camp
- Letter: On Almuric and "Yuetshi" (1966) [ES] by L. Sprague de Camp
- Letter: On Buckles (1966) [ES] by L. Sprague de Camp
- Letter: On "Yuetshi" Again (1966) [ES] by L. Sprague de Camp
- Letter: On Nomenclature (1967) [ES] by L. Sprague de Camp
- Letter (Analog, July 1967) (1967) [ES] by L. Sprague de Camp
- Letter: On Thendara 2 (1967) [ES] by L. Sprague de Camp
- Letter to Joel Frieman, 21 October 1967 (1968) [ES] by L. Sprague de Camp
- Letter (Magazine of Horror, September 1968) (1968) [ES] by L. Sprague de Camp
- Letter: On Europe (1969) [ES] by L. Sprague de Camp
- Letter (Magazine of Horror, July 1969) (1969) [ES] by L. Sprague de Camp
- Letter (Science Fiction Review, August 1969) (1969) [ES] by L. Sprague de Camp
- Letter (Analog, October 1969) (1969) [ES] by L. Sprague de Camp
- Letter: On Dark Snouts (1969) [ES] by L. Sprague de Camp
- Letter (Science Fiction Review, August 1970) (1970) [ES] by L. Sprague de Camp
- Letter (Science Fiction Review, November 1970) (1970) [ES] by L. Sprague de Camp
- Letter (Fantastic, December 1970) (1970) [ES] by L. Sprague de Camp
- Letter (Science Fiction Review, January 1971) (1971) [ES] by L. Sprague de Camp
- Letter (Analog, February 1971) (1971) [ES] by L. Sprague de Camp
- Letter (Science Fiction Review, March 1971) (1971) [ES] by L. Sprague de Camp
- Letter (SF Commentary 24) (1971) [ES] by L. Sprague de Camp
- Swackle (Amra V2n55, December 1971) (1971) [ES] by L. Sprague de Camp
- Letter: On Lovecraft Letters, Brak, Merkur, & Wet Leaves (1971) [ES] by L. Sprague de Camp
- Letter: On Sources (1973) [ES] by L. Sprague de Camp
- Letter: On Animals (1973) [ES] by L. Sprague de Camp
- Letter: On Slopsism (1973) [ES] by L. Sprague de Camp
- Letter: On C. A. Smith (1973) [ES] by L. Sprague de Camp
- Letter: On Lovecraftiness (1973) [ES] by L. Sprague de Camp
- Letter: On "Gurre" (1973) [ES] by L. Sprague de Camp
- Letter: On Two Queries (1973) [ES] by L. Sprague de Camp
- Letter: On Antique Apes (1973) [ES] by L. Sprague de Camp
- Letter: On Quaint Streetcars (1973) [ES] by L. Sprague de Camp
- Letter: On Lovecrafty Inspection (1974) [ES] by L. Sprague de Camp
- Swackle (Amra V2n62, October 1974) (1974) [ES] by L. Sprague de Camp
- Letter: On Unaussprechlichen Kulten (1974) [ES] by L. Sprague de Camp
- Letter (Cross Plains V1n6) (1975) [ES] by L. Sprague de Camp
- Letter (Fantasy Crossroads, November 1975) (1975) [ES] by L. Sprague de Camp
- Letter: The Vulture Croaks Back (1976) [ES] by L. Sprague de Camp [only as by L. Sarcophagus de Camp]
- Letter (Quantum (1975-78), #2) (1976) [ES] by L. Sprague de Camp
- Letter (New Venture, Summer 1976) (1976) [ES] by L. Sprague de Camp
- Letter (The Diversifier #12) (1976) [ES] by L. Sprague de Camp
- Letter (Science Fiction Review #16) (1976) [ES] by L. Sprague de Camp
- Letter (Fantasy Crossroads, February 1976) (1976) [ES] by L. Sprague de Camp
- Letter: On Claymores (1976) [ES] by L. Sprague de Camp
- Letter: On Amras (1976) [ES] by L. Sprague de Camp
- Letter (The Diversifier #15) (1976) [ES] by L. Sprague de Camp
- Letter (Fantasy Crossroads, August 1976) (1976) [ES] by L. Sprague de Camp
- Letter (The Diversifier #17) (1976) [ES] by L. Sprague de Camp
- Letter (REH: Two-Gun Raconteur #4) (1977) [ES] by L. Sprague de Camp
- Letter (Phantasy Digest #2) (1977) [ES] by L. Sprague de Camp
- Letter (F&SF, January 1977) (1977) [ES] by L. Sprague de Camp
- Letter (Fantasy Crossroads, March 1977) (1977) [ES] by L. Sprague de Camp
- Letter (Fantasy Crossroads, November 1977) (1977) [ES] by L. Sprague de Camp
- Letter (Nyctalops, March 1978) (1978) [ES] by L. Sprague de Camp
- Letter (Fantastic, April 1978) (1978) [ES] by L. Sprague de Camp
- Letter (Fantasy Crossroads, June 1978) (1978) [ES] by L. Sprague de Camp
- Letter (Asimov's September-October 1978) (1978) [ES] by L. Sprague de Camp
- Letter (Locus #216) (1978) [ES] by L. Sprague de Camp
- Letter (Fantasy Crossroads, January 1979) (1979) [ES] by L. Sprague de Camp
- Letter (Locus #227) (1979) [ES] by L. Sprague de Camp
- Letter (Locus #235) (1980) [ES] by L. Sprague de Camp
- Letter: On Pizza (1981) [ES] by L. Sprague de Camp
- Letter (Locus #242) (1981) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, Yuletide 1981) (1981) [ES] by L. Sprague de Camp
- Letter (OAK Leaves, V2n15 Spring 1982) (1982) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, Eastertide 1982) (1982) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, Roodmas 1982) (1982) [ES] by L. Sprague de Camp
- Letter (Asimov's, June 1982) (1982) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, St. John's Eve 1982) (1982) [ES] by L. Sprague de Camp
- Letter (Analog, December 1982) (1982) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, St. John's Eve 1983) (1983) [ES] by L. Sprague de Camp
- Letter (Fantasy Newsletter No. 61) (1983) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, Yuletide 1983) (1983) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, St. John's Eve 1984) (1984) [ES] by L. Sprague de Camp
- Letter (Fantasy Review, July 1984) (1984) [ES] by L. Sprague de Camp
- Letter (Locus #282) (1984) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, Lammas 1984) (1984) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, Michaelmas 1984) (1984) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, Eastertide 1985) (1985) [ES] by L. Sprague de Camp
- Letter (Analog, April 1985) (1985) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, Michaelmas 1985) (1985) [ES] by L. Sprague de Camp
- Letter to Joel Frieman, October 21, 1967 ("Dear Joel: / The first time I read a Conan (or other Howard) story...") (1986) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, Michaelmas 1986) (1986) [ES] by L. Sprague de Camp
- Letter [2] (Crypt of Cthulhu, Michaelmas 1986) (1986) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, Hallowmas 1986) (1986) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, Roodmas 1987) (1987) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, Lammas 1987) (1987) [ES] by L. Sprague de Camp
- Letter (Cromlech #2) (1987) [ES] by L. Sprague de Camp
- Letter (Analog, October 1987) (1987) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, Hallowmas 1987) (1987) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, Candlemas 1988) (1988) [ES] by L. Sprague de Camp
- Letter (Analog, May 1988) (1988) [ES] by L. Sprague de Camp
- Letter (Analog, March 1989) (1989) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, Hallowmas 1989) (1989) [ES] by L. Sprague de Camp
- Letter (Analog, February 1990) (1990) [ES] by L. Sprague de Camp
- Letter (Analog, February 1990) [2] (1990) [ES] by L. Sprague de Camp
- Letter (Science Fiction Chronicle #126) (1990) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, Eastertide 1990) (1990) [ES] by L. Sprague de Camp
- Letter (The Barbarian Scroll #15) (1991) [ES] by L. Sprague de Camp
- Letter (Crypt of Cthulhu, Eastertide 1991) (1991) [ES] by L. Sprague de Camp
- Letter to Rusty Burke, May 20, 1984 (excerpt) (2005) [ES] by L. Sprague de Camp