No printing listed but this is the first printing. Actual date not listed in the book.
Publication date and on-sale date taken from the publication date reported to the U.S. Copyright Office found in the Catalog of Copyright Entries, Third Series, Volume 26, Part 1, Number 1, Section 2, Books and Pamphlets, Including Serials and Contributions to Periodicals, Current Registrations M-Z, January-June 1972. Copyright registration number A335773. Copyright is given to King Features Syndicate.