pb?Paperback. Typically 7" by 4.25" (18 cm by 11 cm) or smaller, though trimming errors can cause them to sometimes be slightly (less than 1/4 extra inch) taller or wider/deeper.
Notes: Unknown printing rank (the "November 1972" on copyright page is visibly refering only to the first printing.
Note quasi-ISBN 449-02648-150 on spine.
Artist not credited, usually given as Dean Ellis on other printings.