Universal Reference Library

Universal Reference Library: New Grosset Paperback Series, PW, June 4, 1962, at 94.

Series is based on the German Fischer Lexicon, acc. to The First Four Titles, PW, Jan. 28, 1963, at 249, & started with 4 titles.

According to early ads, Music, Anthropology, Philosophy, and Non-Christian Religions were "The first four titles in a projected reference library of 20 volumes"