Astounding Science Fiction [v47 #3, May 1951] (25¢, 164pp, digest, cover by Hubert Rogers)    
      - 4 · Conservatism · John W. Campbell, Jr. · ed
 
      - 6 · Galactic Gadgeteers · Harry Stine · nv; illustrated by Rogers
 
      - 47 · Success Story [Tree Houses] · Julian Chain · nv; illustrated by Orban
 
      - 70 · Izzard and the Membrane · Walter M. Miller, Jr. · na; illustrated by Rogers
 
      - 117 · Guess Again · J. A. Meyer · ss; illustrated by Edd Cartier
 
      - 121 · In Times to Come · John W. Campbell, Jr. · cl
 
      - 122 · Key Decision · H. B. Fyfe · ss; illustrated by Edd Cartier
 
      - 135 · The Analytical Laboratory: December 1950 & January 1951 · John W. Campbell, Jr. · cl
 
      - 136 · Clipper Ships of Space · Russell Saunders · ar; illustrated by Orban
 
      - 144 · The Argonne Heavy Water Reactor · Atomic Energy Commission · ar
 
      - 149 · Book Reviews · P. Schuyler Miller & C. Coffin · rc
 
      - _149 · The Castle of Iron, L. Sprague de Camp & Fletcher Pratt; New York: Gnome Press, 1950. 224 p. 50-11580. · P. Schuyler Miller · br [Ref. L. Sprague de Camp & Fletcher Pratt]
 
      - _149-150 · The Bridge of Light, A. Hyatt Verrill; Reading, Pa.: Fantasy Press, 1950. 248 p. 50-8738. · P. Schuyler Miller · br [Ref. A. Hyatt Verrill]
 
      - _150 · The Big Book of Science Fiction, ed. Groff Conklin; New York: Crown, 1950. 545 p. 50-9548. · P. Schuyler Miller · br [Ref. Groff Conklin]
 
      - _150-151 · Ralph 124C 41+, Hugo Gernsback; New York: Frederick Fell, 1950. 207 p. 50-13967. · P. Schuyler Miller · br [Ref. Hugo Gernsback]
 
      - _151 · The Man Who Lived Backward, Malcolm Ross; New York: Farrar, Strauss & Co., 1950. 461 p. 50-8807. · P. Schuyler Miller · br [Ref. Malcolm Ross]
 
      - _151-152 · Genus Homo, L. Sprague de Camp & P. Schuyler Miller; Reading, Pa., Fantasy Press, 1950. 225 p. 50-14610. · C. Coffin · br [Ref. L. Sprague de Camp & P. Schuyler Miller]
 
      - _152 · The Voyage of the Space Beagle, A.E. van Vogt; New York: Simon & Schuster, 1950. 240 p. 50-14253. · P. Schuyler Miller · br [Ref. A. E. van Vogt]
 
      - 153 · Brass Tacks · The Readers · lc
 
      - _153 · [letter] · Willy Ley · lt
 
      - _154 · [letter from Berkeley 3, CA] · Les & E. Cole · lt
 
      - _155 · [letter] · James Blish · lt
 
      - _156 · [letter from Urbana, IL] · Martin Davis · lt
 
      - _158 · [letter from Upton, NY] · James S. Robertson, M.D., PhD. · lt
 
      - _159 · [letter from Cleveland 8, OH] · Alan F. Wilson · lt
 
     
   
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