The collection consists of materials accumulated by Westbrook while researching his dissertation on the history of Scientology and includes books, lectures, periodicals, Freedom of Information Act (FOIA) documents, and ephemera, as well as a copy of Westbrook's CGU dissertation (2015).

Books include rare and first edition books as well as miscellaneous or rare secondary sources and are part of the Publications series along with course packs and periodicals. Lectures and other CDs and DVDs comprise a large series of audio/visual materials. Ephemeral materials come from Los Angeles, the Delphian School (Oregon), Saint Hill Manor (United Kingdom), Washington, D.C., the Flag Service Organization (Florida), the Citizens Commission on Human Rights, and the International Association of Scientologists. Documents obtained from the CIA and FBI under the Freedom of Information Act and Westbrook’s dissertation are included in the Research series.

Materials date as far back as 1950 when Hubbard authored a number of works, including Dianetics: The Modern Science of Mental Health. The bulk of the materials are authored by L. Ron Hubbard, the Founder of Dianetics and Scientology. Most of the copyrights of these materials belong to the L. Ron Hubbard Library and are published by Bridge Publications, Inc. or Golden Era Productions. Some of the materials, in particular the ephemera, include trademarks and service marks held by the Religious Technology Center.