Heinlein on Science Fiction: The Discovery of the Future (GoH Speech, Third WorldCon, Denver, 1941)
| First published | April 1973 |
|---|---|
| Type | Interior Art |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| April 1973 |
|
Vertex: The Magazine of Science Fiction, April 1973 | Mankind Publishing Company | MAGAZINE | 46 |