The Alien Worlds
From Author Wars - https://authorwars.com/books/the-alien-worlds-118557.html
Editions/Publications:
- Unknown. Amazing Stories, September 1964 (Unknown, Ben Bova, Ziff-Davis Publishing Company, $0.50, 132 pages, digest, MAGAZINE)
- Unknown. Thrilling Science Fiction, June 1974 (Unknown, Ben Bova, Ultimate Publishing Co., Inc., $0.60, 134 pages, digest, MAGAZINE)