Letter (Astounding Stories, December 1937): Celestial Mechanics Continued.
From Author Wars - https://authorwars.com/books/letter-astounding-stories-december-1937-celestial-mechanics-continued-2096400.html
Overview:
Editions/Publications:
- Unknown. Astounding Stories, December 1937 (Unknown, Jim Blish, Street & Smith Publications, Inc., $0.20, 164 pages, pulp, MAGAZINE)