On Building Walls
From Author Wars - https://authorwars.com/books/on-building-walls-884189.html
Editions/Publications:
- Unknown. Worlds of If, September-October 1974 (Unknown, Baen, UPD Publishing Corporation, $0.75, 180 pages, digest, MAGAZINE)
- Unknown. Worlds of If, September-October 1974 [UK] (Unknown, Baen, Universal-Tandem Publishing Company Ltd., £0.30, 180 pages, digest, MAGAZINE)