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Copyright 1950, 1952, 1955-1959 by United Feature Syndicate, Inc. on copyright page and covers. Humor genre listed. Known printing information: 48th printing: circa 1977. No series number or ISBN listed on cover. Actual printing date not listed, date a guess based on publisher and cover price listed. 50th printing: circa 1979. Series number and ISBN listed on cover. Actual printing date not listed, date a guess based on cover price listed. This book also a part of the Snoopy boxed set (# 6-4228). Unknown printing: December 1981, 1.75 USD cover price. Price and date from Books in Print online. Unknown printing: circa 1983, 1.95 USD cover price. Price from Books in Print online. Currently no known 1.50 USD cover price version.