Contents (view Concise Listing)

• 132 32 • Scientific Mysteries: (Mystery of Size) • [Scientific Mysteries] • essay by Joseph J. Millard
• 8 • Lords of the Underworld • (1941) • novella by L. Taylor Hansen
• 48 • King Arthur's Knight in a Yankee Court • (1941) • novelette by Arthur William Bernal [as by A. W. Bernal]
• 70 • Big Man • (1941) • novelette by Ross Rocklynne
• 88 • Priestess of the Sleeping Death • [Durna Rangue • 8] • (1941) • novelette by Neil R. Jones
• 106 • Invisible Raiders of Venus • (1941) • short story by Don Wilcox
• 120 • Killer's Turnabout • (1941) • short story by William P. McGivern
• 124 • Scientific Mysteries: Earth's Amazing Atmosphere • [Scientific Mysteries] • (1941) • essay by Joseph J. Millard
• 128 • The Prophecies of Gizeh • (1941) • essay by Joseph J. Millard
• 131 • Meet the Authors: Neil R. Jones • (1941) • essay by Neil R. Jones
• 144 • A City on Uranus • (1941) • essay by unknown [as by Henry Gade]
• 8 • Black Pirates of Barsoom • [Barsoom] • (1941) • novella by Edgar Rice Burroughs
• 44 • Lost Treasure of Angkor • (1941) • novelette by James Norman
• 72 • The Girl from Venus • (1941) • short story by David V. Reed
• 86 • Ersatz • (1941) • essay by William P. McGivern
• 87 • Cagliostro - Magnificent Charlatan • (1941) • essay by William P. McGivern
• 88 • The Quandary of Quintus Quaggle • (1941) • short story by William P. McGivern
• 102 • Pepper Pot Planet • (1941) • short story by David Wright O'Brien [as by Duncan Farnsworth]
• 114 • Homer Higginbottom, Rain Maker • (1941) • novelette by Milton Kaletsky
• 132 • Scientific Mysteries: (Lightning) • [Scientific Mysteries] • essay by Joseph J. Millard
• 135 • Strange But True • essay by William P. McGivern
• 138 • Meet the Authors: Edgar Rice Burroughs • (1941) • essay by Edgar Rice Burroughs
• 146 • A City on Pluto • (1941) • essay by unknown [as by Henry Gade]
• 8 • Survivors from 9000 B.C. • (1941) • novella by Robert Moore Williams
• 46 • Mystery on Planetoid Ten • (1941) • novelette by James Norman
• 70 • No Man's Land in Space • [The Asteroid Belt] • (1941) • novelette by Leigh Brackett
• 89 • Progress Is a Headache • (1941) • essay by David Wright O'Brien [as by John York Cabot]
• 90 • Sidetrack in Time • (1941) • short story by William P. McGivern
• 95 • Broadcast by Bees • (1941) • essay by William P. McGivern [as by P. F. Costello]
• 96 • 10 Seconds from Nowhere • (1941) • short story by David Wright O'Brien
• 101 • How Smart Were the Ancients? • (1941) • essay by William P. McGivern
• 102 • The Invincible Crime-Buster • (1941) • novelette by Raymond A. Palmer [as by Henry Gade]
• 136 • Meet the Authors: Leigh Brackett • (1941) • essay by Leigh Brackett
• 145 • A City on Io • (1941) • essay by unknown [as by Henry Gade]