I'm certain I've linked to the State University of New York at Buffalo's George Kelley Paperback and Pulp Fiction collection before, but their Web site seems to have gotten a redesign and an upgrade since the last time I was there. They have a database that allows many searches, and, in addition to the cover art, there are plot summaries, lists of characters and a breakdown of various topics like instances of violence, sexuality, substance abuse..etc...
If you just wanna look at pictures, however, there's the cover art gallery here and the cover database here.
Revue of Reviewers, 10-16-17 - *Critiquing some of the most interesting recent crime, mystery, and thriller releases. Click on the individual covers to read more.*
23 hours ago