From the introduction:
The purpose of the Fancyclopedia II, not fully realized, is to revise and bring up to date the original Fancyclopedia of Jack Speer. Here we have attempted to define as many as possible of the expressions which have an esoteric meaning among fantasy fans, and to supply other information, such as that on Charles Fort, which may be needed to understand what fans say, write, and do. Certain fields have been sketchily covered here because they are well taken care of elsewhere; for instance, tho nicknames of fans and pet names of fanzines are touched on, biographies have been left to the various Who's Whos in fanzines, and fanzines in detail to the Swisher-Pavlat-Evans Checklist.
Fancyclopedia 2 was published a decade before the first roleplaying game products, but is nevertheless a curious and significant artifact in the gradual development of science-fantasy fandom, which in turn heavily influenced the first decades of roleplaying.