First Breakthrough

From Author Wars - https://authorwars.com/books/first-breakthrough-193761.html

Overview:

Title: First Breakthrough
Author: Roy Malcolm
Year: 1958
Type: Essays

Editions/Publications:

Unknown. Nebula Science Fiction, Number 35 (Unknown, Roy Malcolm, Peter Hamilton, 2/-, 112 pages, digest, MAGAZINE)
Unknown. Nebula Science Fiction [US], February 1959 (Unknown, Roy Malcolm, Peter Hamilton, $0.35, 112 pages, digest, MAGAZINE)