Double or Quits x 12

1941 Morrow hardcover, his 5th with private eyes Bertha Cool and Donald Lam

1942 Dell mapback reissue – cover art by Gerald Gregg

1951 British Publishers Guild reissue

1953 Dell reissue, cover art by Fred Scotwood

better image than previously posted

1960 Dell reissue – cover art by Robert McGinnis

better image than previously posted

British 1961 Corgi reissue

1963 Dell reissue – cover art by Stanley Borack

British 1964 Corgi reissue

1966 Dell reissue – cover art by Robert Abbett

early 70s Dell reissue

1991 Avon reissue

2022 Mysterious Press/Open Road reissue

[post updated 9/26]