Ads for UFO publications and lectures, 1950s and 1960

Ads for books, lectures, conventions, and the 1956 film UFO.  Books and lectures are by well-known and marginally known figures in the "flying saucer" scene of the 1950s and 1960s, including Donald Keyhoe, Orval Lee Jaggers, Orfeo Angelucci, Truman Bethurum, Cyril Richardson, John Otto, Bryant and Helen Reeve, Robert C. Gardner, Calvin Girvin, Reinhold O. Schmidt, Gloria Lee, Howard Menger, Gray Barker, and others. The extent of publications and presenters indicates the level of public interest in this topic during that time period.