Eofandom, from about 1930 to 1933, existed before fandom became an entity; generally comprised of folk with no sense of group existence whose interests were in collecting stf and scientificomics, and who eagerly hunted down any items with any sort of stfnal significance. Such fanzines as Science Fiction Digest and The Comet were the mags of the day. Primitive trilobites crawled about on the ocean floor. Letter-writing was a major activity, and stfnists depended on hcs of the past as much as, or more than, prozines for sustenance.
Source: wiktionary