Retrograde Evolution

Overview:

• Title: Retrograde Evolution
• Author: Clifford D. Simak
• Year: 1953
• Type: Short Fiction

Editions/Publications:

• 1956. Strangers in the Universe (1956, Clifford D. Simak, Collection)
• 1956. Strangers in the Universe (1956, Clifford D. Simak Berkley, Catalog ID: #G-71, $0.35, 190 pages, Paperback, Collection)
• 1956. Strangers in the Universe (1956, Clifford D. Simak Simon & Schuster, $3.50, 371 pages, Hardcover, Collection)

Resources: