Supercivilizations
From Author Wars - https://authorwars.com/books/supercivilizations-123717.html
Overview:
- Title: Supercivilizations
- Author: Gregory Benford
- Year: 1973
- Type: Essays
Editions/Publications:
- Unknown. Vertex: The Magazine of Science Fiction, October 1973 (Unknown, Gregory Benford, Mankind Publishing Company, $1.50, 100 pages, quarto, MAGAZINE)