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Unknown (also known as Unknown Worlds) was an American pulp magazine, published from 1939 to 1943. It was edited by John W. Campbell who also edited Astounding Science Fiction, which also published some of Fritz’s stories.
Covers are only shown where they are for one of Fritz’s stories.

CoverStoryIssue
Two Sought Adventure (aka The Jewels in the Forest) 1939 / 08
The Bleak Shore1940 / 11
The Howling Tower 1941 / 06
http://www.lankhmar.co.uk/wp-content/uploads/2014/04/UNK_0027.jpgThe Smoke Ghost 1941 / 10
The Sunken Land 1942 / 02
The Hill and the Hole 1942 / 08