There are two existing microfilm versions of the Project Blue Book records. The USAF Archives produced a 16mm microfilm version for its own record prior to transfer of the records to the National Archives. The National Archives, in accord with its privacy policy, blacked-out the primary witness names and contact information in the documents prior to producing its 35mm microfilm version for public release. The earlier, unredacted 16mm version is colloquially referred to as the Maxwell-NARA version. See: Records of Headquarters United States Air Force (Air Staff); Records of Project Blue Book 1947-69, Record Group 341.15 (NARA Microfilm Publication T1206); National Archives at College Park, College Park, MD. The records are available on line from: BlueBookArchive.org; and Footnote.com.