The bulk of the Barker collection is made up of various magazines, magazine articles, newspaper clippings, conference advertisements and reports, and posters Barker gathered over the course of his life. Barker also carried on correspondence conversations with ufologists, avid enthusiasts, and fans from around the world maintaining the letter and copies of his replies.
The Barker Files are arranged alphabetically and divided by subject, person of origin, or year. Information pertaining to any subject within the world of ufology can be found among the files. Some of the more recognizable files would include the R. E. Straith Letter, the Men in Black, George Adamski, Howard Menger, Morris Jessup, and James Moseley. Information can be requested via mail, email or phone by contacting David Houchin or visiting the collection.