Unknown, August 1940
| 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 | L. Sprague de Camp, Fletcher Pratt, Theodore Sturgeon, J. Vale Downie, Mona Farnsworth, Marian O'Hearn |
| Illustrator | Edd Cartier, Paul Orban, Charles Schneeman |
| Format | Pulp Magazine |
| Language | English |
| Location | New York, NY |
| Copyright | 1940 |
| Cover Date | 1940-08-00 |
| Pages / Font | 164 pages |
| Volume Number | III |
| Issue Number | 6 |
| Chapters | NOVEL 9 • The Mathematics of Magic, by L. Sprague de Camp and Fletcher Pratt NOVELETTE 97 • It, by Theodore Sturgeon SHORT STORIES 84 • Tombi Sink, by J. Vale Downie 118 • All Roads, by Mona Farnsworth SERIAL 131 • The Spark of Allah (Second of Three Parts), by Marian O'Hearn READERS' DEPARTMENTS 6 • Of Things Beyond 160 • —And Having Writ— |
| Notes | "The Mathematics of Magic" is the second Incomplete Enchanter story. |
Added by ThomasP64