J. Allen Hynek's most popular book is The UFO Experience: A Scientific Inquiry with 6 saves and an average rating of -.
Series
15 released booksAuthored 13% of series
Collector's Library of the Unknown is a 15-book series with 15 released primary works first released in 1882 with contributions by Ignatius L. Donnelly, Frederick Bligh Bond, and Upton Sinclair.