Robert M. Guinn
President 3
| Title | Format | |
|---|---|---|
 | Worlds of Tomorrow, April 1963 | Magazine |
 | Worlds of Tomorrow, June 1964 | Magazine |
 | Worlds of Tomorrow, August 1964 | Magazine |
Publisher 6
| Title | Format | |
|---|---|---|
 | Worlds of Tomorrow, May 1965 | Magazine |
 | Worlds of Tomorrow, November 1965 | Magazine |
 | Worlds of Tomorrow, May 1966 | Magazine |
 | Worlds of Tomorrow, February 1967 | Magazine |
 | Worlds of Tomorrow, May 1967 | Magazine |
 | Worlds of Fantasy Vol. 1 No. 1 | Magazine |