Baby Sitter's Guide by Dennis the Menace #12888-1

Fourth printing known. Likely had a first Ballantine Books printing as well, but details on that printing's publication date is not known.

Copyright 1954, 1959-1961 by Hank Ketcham. Includes an unspecified number of additional cartoons not in Holt, Rinehart and Winston original. Includes prose by Bob Harmon accompaning Dennis cartoons. Date a guess based on series number.