Letter (Astonishing Stories, April 1940): Not 4 "4E"

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Overview:

Title: Letter (Astonishing Stories, April 1940): Not 4 "4E"
Author: Jim Blish
Year: 1940
Type: Essays

Editions/Publications:

Unknown. Astonishing Stories, April 1940 (Unknown, Jim Blish, Fictioneers, Inc., $0.10, 116 pages, pulp, MAGAZINE)