Beetle Bailey That Sinking Feeling #56124-4 / 56125-2

First printing. Copyright 1971-1972, 1980, 1982, 1985 (does not mention King Features Syndicate). Humor genre listed on the spine.

The book has dual Mass Market paperback series numbers and ISBNs for the U.S. and Canada. U.S.: 56124-4 and 0-812-56124-4. Canada: 56125-2 and 0-812-56125-2.