black-hands: Wives to Burn by Lawrence G. Blochman. (1946)Cover art by Gerald Gregg. Found here.
The Frightened Stiff by Kelly Roos. Book cover illustration by Gerald Gregg. Found here.
black-hands: Villa Cascara by Mr. A. Roothaert, 1950.Dust jacket by Rein van Looij. Found at Booktryst.
The Shadow Intervenes Dutch detective of Havank - De Schaduw Grijpt In Book cover illustration by Ben Mohr. (1949) Found here.
The Sign of Death Dutch detective by The Aresby’s - Het Teeken van den Dood.Book cover illustration signed by PH. (1930’s) Found here.
Reply Paid by H. F. Heard.Book cover illustration by Siegel. (1960’s) Found here.