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:
• "First International Edition: September 1987"
• "First U.S. Edition: October 1987"
• "Tenth Printing: December 1993"; no number line
• "Cover Art by Michael Whelan" on copyright page, the artwork is also 'signed'
• $6.95 in Canada