Astounding Science-Fiction [v25 #4, June 1940] (20¢, 164pp, trimmed pulp, cover by Hubert Rogers)
- 6 · The Old Navy Game · John W. Campbell, Jr. · ed
- 9 · The Roads Must Roll · Robert A. Heinlein · nv
- 38 · Deputy Correspondent · Harl Vincent · ss
- 51 · The Carbon Eater · Douglas Drew · nv
- 79 · Unseen Tools · Leo Vernon · ar
- 90 · The Testament of Akubii · Norman L. Knight · ss
- 100 · Introduction to a Nameless Science · Peter van Dresser · ar
- 113 · Final Blackout [Part 3 of 3] · L. Ron Hubbard · n.
- 151 · Permanent Electret · Anon. · ms
- 152 · Brass Tacks · [The Readers] · lc
- _152 · [letter from New York, NY] · Wynne M. Trenholme · lt
- _153 · [letter from Hagerstown, MD] · Harry Warner, Jr. · lt
- _154 · [letter from Andrews, NC] · W. A. Eubank · lt; given as by W.A. Erbank.
- _154 · [letter from Girard, CA] · Myrtle Gebhart · lt
- _155 · [letter from Bloomington, IL] · Bob Tucker · lt
- _155 · [letter from Balboa Heights, Canal Zone] · F. D. Price · lt
- _155 · [letter from Kansas City, MO] · Don Johnson · lt
- _156 · [letter from New York, NY] · Langley Searles · lt
- _156 · [letter from New Orleans, LA] · Max Moore · lt
- _156 · [letter from Washington, DC] · Charles E. Tripp · lt
- _157 · [letter from San Ysidro, CA] · Lew Cunningham · lt
- _158 · [letter from Seattle, WA] · Fred J. Melberg, Jr. · lt
- _158 · [letter from Michigan City, IN] · W. K. Verniaud · lt; given as by W.K. Vemiaud.
- _159 · [letter from Kingston, Ontario, Canada] · A. Arthur Smith · lt
- 160 · Slip-Stickers Department: Reaction Motor · Norman F. Stanley · cl
- _160 · [letter from Rockland, ME] · Norman F. Stanley · lt
- 161 · Science Discussions · [The Readers] · lc
- _161 · [letter from Watertown, CT] · Selden G. Thomas · lt
- _162 · [letter from Columbus, OH] · Thomas S. Gardner · lt
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