Secret of the Yellow Crystal

From Author Wars - https://authorwars.com/books/secret-of-the-yellow-crystal-849168.html

Overview:

Title: Secret of the Yellow Crystal
Author: Julian S. Krupa
Year: 1948
Type: Interior Art

Editions/Publications:

Unknown. Amazing Stories, April 1948 (Unknown, Julian S. Krupa, Ziff-Davis Publishing Company, $0.25, 180 pages, pulp, MAGAZINE)
Unknown. Science Fiction Adventures, March 1973 (Unknown, Julian S. Krupa, Ultimate Publishing Co., Inc., $0.60, 132 pages, digest, MAGAZINE)