Stewart Sterling was a pseudonym of Prentice Winchell, who also wrote under four other names.
1951 Dutton hardcover, this the later 1953 Dell reprint
cover art by Bob Hilbert
better image than previously posted
cover painting by Robert McGinnis
Carter Brown was a pseudonym for Alan Geoffrey Yates 1969 Horowitz paperback reprinted that same year by Signet
better image than previously posted
1963 Gold Star paperback original in the US, revised from the 1960 UK Roberts release as Ripe for Rapture
cover art by Robert Maguire
cover art by Joaquin ‘Chaco’ Chacopino
pseudonym of (Ronald) Douglas Sanderson
1956 Gold Medal paperback original
cover art by Barye Phillips
better image than previously posted
SMB Noir 