Published by Ziff-Davis, Mammoth Mystery was a crime fiction magazine that ran for 11 issues, from 1945 to 1947.  Thought the magazine had a short run, contributions from writers like Robert Bloch and covers from artists like Arnold Kohn have made it popular amongst collectors.  Below is a small sampling of the covers of Mammoth Mystery.

January 1946. By RR Epperly

June, 1946. By Arnold Kohn.

August, 1946. By Arnold Kohn

February, 1947. By Arnold Kohn

April, 1947. By Arnold Kohn