"The Burrowers Beneath" by Fritz Leiber

From Author Wars - https://authorwars.com/books/the-burrowers-beneath-by-fritz-leiber-1314226.html

Overview:

Title: "The Burrowers Beneath" by Fritz Leiber
Author: Edward P. Berglund
Year: 1989
Type: Essays

Variant Titles:

1989. The Shadows over Fritz Leiber

Editions/Publications:

Unknown. Crypt of Cthulhu, Lammas 1989 (Unknown, Edward P. Berglund, Cryptic Publications, $4.50, 56 pages, A5, FANZINE)