by Charles Fort
The first book of Charles Fort’s famous tetralogy on all sorts of weird and unexplained phenomena that defy scientific dogma, and, for that matter, any logical explanation.

by R. DeWitt Miller
Subject: Strange and unexplained phenomena.

Strange and unexplained phenomena.

by Morris K. Jessup
UFOs' Research.
One of the best –and hard to find– books ever written on the UFO phenomenon, by a well-known astronomer and University professor much involved in the “Philadelphia Experiment” case – and who died under suspicious circumstances soon after writing this book.

by James Churchward
The most famous book on Mu –the first of the series– by Colonel James Churcward. The story of of Empire of Mu (that some identify with Lemuria), the vanished continent that, according to some legends, sank under the Pacific Ocean. With all the original illustrations and figures.

by Edward J. Ruppelt
One of the best and most authoritative books ever written on the UFO phenomenon, by the former head of the U.S. Air Force Project Blue Book, an official operation of the Air Technical Intelligence Center.

by Charles Fort
Strange and unexplained phenomena.

by Charles Fort
Subject: Strange and unexplained phenomena. "Give me more data for thinking that around this earth there is a starry shell that is not vastly far away, and here is the base for a correlation of all things phenomenal". Ch. Fort

by Donald E. Keyhoe
One of the most widely read and discussed books ever written on the UFO phenomenon, by Major Donald E. Keyhoe, a former U.S. Marines’ pilot, Director of N.I.C.A.P., and the first modern Ufologist.