Notes:
Copyright 1968 by United Feature Syndicate Inc.
Known printings:
7th printing, 1976, no price on cover.
9th printing, 1978, no price on cover.
11th printing, 1979, no price on cover.
13th printing, circa 1979, no price on cover.
Dimensions:
small mass market paperback (4 1/4" x 6 3/8"; 10.7 cm x 16.2 cm), later standard mass market paperback (4 1/4" x 6 7/8"; 10.9 cm x 17.3 cm)