I've just read the newly published The Pseudoscience Wars (Chicago: University of Chicago Press) - highly recommend. Fascinating and well written.
What other books might have been found in a bookstore or on a newsstand in April 1950? Here are three, the first two in Canada, the last in the US.
Dell 9702 - August 1972 (10th printing)
Dell 9702 back
Harlequin 42 - April 1950
News Stand Library 103 - April 1950
News Stand Library 23A (with DJ) - April 1950