Genus Homo
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Editions/Publications:
- Unknown. Astounding Science Fiction, May 1951 (Unknown, C. Coffin, Street & Smith Publications, Inc., $0.25, 164 pages, digest, MAGAZINE)
- Unknown. Astounding Science Fiction, May 1951 (Unknown, L. Sprague de Camp, Street & Smith Publications, Inc., $0.25, 164 pages, digest, MAGAZINE)
- Unknown. Astounding Science Fiction, May 1951 (Unknown, P. Schuyler Miller, Street & Smith Publications, Inc., $0.25, 164 pages, digest, MAGAZINE)