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: Cover uncredited, but clearly signed. Confirmed by Jane Frank in "The Art of Richard Powers," 2001, ISBN 1-85585-890-8.
Second printing, first Canadian printing
Date from copyright page of the third printing