Indicia date is January, February and March 1952. Cover date is Spring. Possible arrival date based on front cover stamp of indexer's copy.
Cover art credit authenticated by article in ILLUSTRATION MAGAZINE No. 18 Winter 2007.
In black and white on inside front cover.
Writer credit from Ed Silverman interview in Alter Ego magazine #120 (TwoMorrows, September 2013).
Part of Howard Nostrand's name is visible on a poster on page 1, panel. Martin Epp's name is on the same poster. Bob Powell's name is signed in the last panel to the left of The End. Pencils are definitely his.
full page house ad for Ellery Queen (Ziff-Davis, 1952 Series) #1 (Spring 1952 issue), advertised as "Now On Sale!"