Threads of Time
From Author Wars - https://authorwars.com/books/threads-of-time-161532.html
Editions/Publications:
- Unknown. Vertex: The Magazine of Science Fiction, April 1975 (Unknown, Don Pfeil, Mankind Publishing Company, $1.50, 100 pages, quarto, MAGAZINE)
- Unknown. Vertex: The Magazine of Science Fiction, April 1975 (Unknown, Robert Silverberg, Mankind Publishing Company, $1.50, 100 pages, quarto, MAGAZINE)