A Chronology of Worldcons
From Author Wars - https://authorwars.com/books/a-chronology-of-worldcons-1888384.html
Overview:
- Title: A Chronology of Worldcons
- Author: uncredited
- Year: 1970
- Type: Essays
Editions/Publications:
- 1970 . Heicon '70 International (1970, uncredited, Heicon '70 Committee, DM 5, 74 pages, Pamphlet, Non-fiction)