Records of Project Blue Book, 1947-1969, Record Group 341.15, Publication Number: T1206, Roll 82, Minot AFB, ND, 24 Oct. 1968, National Archives and Records Administration, College Park, Maryland. See: NARA Microfilm Publication T1206. The Project Blue Book Archives available online from: http://bluebookarchive.org/. Also available from: http://www.fold3.com/documents/6283401/project_blue_book_ufo_investigations/.