Multiple printings exist. The publication date is for the first printing.
Indexed from a 16th printing: price = 4.95 USD; 5.95 CAD. This printing has a deep red cover with slightly yellow title text, slight differences from our scan.
Library of Congress Catalog Card Number 79-93191.
Copyright 1980 by United Feature Syndicate, Inc.
The on-sale date is the publication date reported on the copyright registration.