Contains incoming and outgoing correspondence, the latter in the form of either carboncopies or photocopies. The series is arranged alphabetically, and then chronologically within each folder, and comprised of folders originally labeled by Klass as miscellaneous. For particularly extensive or relevant correspondence, we have provided individual folders. Among the several folders labeled as "Miscellaneous Correspondence" are materials that relate either to Klass's publications or to other UFO topic. Correspondence related to UFO cases investigated by Klass is located in Series II.

Series II is comprised of "case files" relating to UFO investigations that were either undertaken by Klass, or that were otherwise of interest. Case files include correspondence, newspaper clippings, government reports, and photographs. Among the most noteworthy material in this series is Klass's extensive correspondence with Bruce Maccabee -- a physicist employed by the Naval Surface Warfare Center and a leading pro-UFOlogist. Klass considered their investigation of the 1978 New Zealand UFO Case (as his most challenging and time consuming investigation. The basis of this investigation is that a TV camera crew flying off the coast of New Zealand filmed a giant glowing ball. Klass eventually determined the object to be the lights from a Japanese squid boat filmed through an improperly installed telephoto lens. In addition to their letters, maps, photographs, nomograns and charts were used to facilitate an understanding of the case's technical aspects.

Subject files on UFOs and alien abductions, consisting mostly of newspaper and magazine clippings, opinion pieces, government reports, and some correspondence. Of particular note is the file on the Volunteer Flight Officers Network (VFON) which was created in the mid-1960s by pro-UFOlogist Herbert Roth, a United Airlines employee. The organization was intended to help the North American Aerospace Defense Command (NORAD) refine its computer software for predicting atmospheric reentry of satellites and rockets. Roth secretly hoped VFON might also report UFOs. The file does show that pilot reports of UFOs were greatest during the period public interest, but when interest waned so did pilot reports. The material is semi-unique and may not be available anywhere else unless Roth maintained his own files. The project was ended in the late-1960s when NORAD and United Airlines discontinued funding.

Material on the Strategic Defense Initiative (SDI) "Star Wars" program, and ballistic missile defense systems. Klass collected this material with the intention of writing a book on space weapons. The series is primarily comprised of newspaper and magazine articles, in addition to government publications. The series is arranged chronologically, with notable works in their own folder. Klass originally had these items arranged chronologically in binders. The original order has been maintained as much as possible. The only non-UFO material in the collection developed out of Klass' work at Aviation Week is the SDI material in Series IV. Klass began covering topics related to space defense weapons for the magazine in the late 1960s-anticipating an arms race in space. He proposed a book to his publisher Random House tentatively titled "Race to War in Space" in 1981 and was turned down. Klass had doubts at to the feasibility of creating a space defense system, and feared it would accelerate a space race. From 1981 to 1991 he continued to collect all available material on the subject in anticipation of writing a book until around 1987 when it became apparent that SDI was doomed. In addition, Klass was a long-time friend of Lt. General Jim Abrahamson who headed the Strategic Defense Initiative Organization.

Published proceedings, transcripts, and related correspondence for UFO conferences. The series is arranged alphabetically, and then chronologically within each folder. Material and correspondence related to various UFO conferences. Published proceedings from the MUFON conferences have been transferred to the Library's Printed Materials department.

UFO and SDI periodicals collected by Klass, as well as Klass's Skeptic UFO Newsletter (SUN). The series is arranged alphabetically by title, and then chronologically.

The periodicals in Series VI range from single issues to complete runs of works published within the United States, as well as international works such as the German pro-UFO publication CENAP Report. Also in this series is Klass' own Skeptical UFO Newsletter which he began publishing on a bi-monthly schedule in 1989 and has attracted over 300 subscribers.

Video and audio tapes relating to UFO and SDI programs that Klass either recorded purchased or from television. The audio tapes include recordings of lectures and radio/TV interviews by some of the UFO movement leaders (such as James E. McDonald and J. Allen Hynek), in addition to interviews Klass conducted as part of his own investigations. Finally, most of the printed materials which Klass donated have been transferred to the Printed Materials department.

Due to copyright restrictions, material in this series cannot be copied.

Contains unpublished works by other authors, gray literature, and galley proofs for Klass' book "The Real Roswell Crashed-Saucer Coverup." Correspondence and other items once folded into published works have been removed and placed in folders in this series, with the published works themselves transferred to the Printed Material Department for storage. For a complete listing of published titles, see the separation report above.