Unknown, September 1939
| Editor | John W. Campbell, Jr. |
| Publisher | Street And Smith Publications, Inc. |
| Periodical Title | Unknown / Unknown Worlds |
| Copyright Holder | Street And Smith Publications, Inc. |
| Contributing Writer | H. L. Gold, L. Sprague de Camp, Silaki Ali Hassan, H. W. Guernsey, Lester del Rey, Ray Cummings, Eric Frank Russell |
| Illustrator | Edd Cartier, M. Isip, Paul Orban, Charles Schneeman, Frank Kramer |
| Format | Pulp Magazine |
| Language | English |
| Location | New York, NY |
| Copyright | 1939 |
| Cover Date | 1939-09-00 |
| Pages / Font | 164 pages |
| Volume Number | II |
| Issue Number | 1 |
| Chapters | COMPLETE BOOK-LENGTH NOVEL 9 • None But Lucifer, by H. L. Gold and L. Sprague de Camp NOVELETTE 91 • Caliph of Yafri, by Silaki Ali Hassan SHORT STORIES 79 • Danger: Quicksand, by H. W. Guernsey 110 • The Coppersmith, by Lester del Rey 121 • Portrait, by Ray Cummings ARTICLE 129 • Over the Border. by Eric Frank Russell READERS' DEPARTMENTS 5 • Of Things Beyond 141 • —And Having Writ— |
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