| All Series | No on Sale Date | On Sale Date |
| Unknown Worlds of Science Fiction | |||||
| number | publicationdate | sortcode | onsaledate | genre | |
| 1 | January 1975 | 58085 | 1974-10-15 | science fiction satire-parody | Original work |
| 2 | March 1975 | 58086 | 1974-12-29 | science fiction | Original work |
| 3 | May 1975 | 58087 | 1975-02-24 | science fiction sword and sorcery | Original work |
| 4 | July 1975 | 58088 | 1975-04-22 | science fiction | Original work |
| 5 | September 1975 | 58089 | 1975-06-17 | science fiction | Original work |
| 6 | November 1975 | 58090 | 1975-08-12 | science fiction | Original work |