Pulp Parade #309: Untoward discovery

Pulp Parade #307: Mystery cover
Pulp Parade #310: Specimens

This is Thrilling Wonder Stories for August 1952, cover by Ed Emshwiller. The ISFDB entry for this issue is here. I found this version of the cover at Pulp Covers. Some interior art by Paul Orban, illustrating Alan E. Nourse’s story, “Counterfeit:”

You can read and download the whole issue at the Internet Archive.