
better image than previously posted
cover art by Lejaren Hiller?
1935 Morrow hardcover as The Clew of the Forgotten Murder as by Carleton Kendrake

April 1953 Pocket paperback reissue, 19th printing
cover painting by Frank McCarthy
better image than previously posted

cover art by Ernest Chiriacka (Darcy)

1947 Morrow hardcover, first edition. Original dust jacket.
29th Perry Mason novel

March 1952 Pocket paperback reissue, third printing
cover art by Earle Bergey

November 1960 Pocket paperback reissue, 5th printing
cover art by Charles Binger
better image than previously posted

November 1959 Cardinal paperback reissue, first printing
cover art by Charles Binger
better image than previously posted

most other covers were by William Reusswig
“Hijacker’s Code” by Erle Stanley Gardner (Paul Pry)
better image than previously posted

June 1959 Cardinal paperback, 1st print, 1st paperback
cover painting by Darrell Greene
better image than previously posted

better image than previously posted
cover art by William Reusswig
Erle Stanley Gardner, “The Hand of Horror” (Reed Sampsell)
Frederick Nebel, “Chains of Darkness” (Cardigan)
Frederick C. Davis, “Dead Men Walk” (Det. Lt. Bartholomew Brandt)
Richard J. Credicott, “The Ghoul of Murder Manor”