UFO Article:
“UFO Incidents over Minot AFB, ND, 1967, 1968”
(UFO Casebook, Belton, Texas)

The article is written by Francis L. Ridge, Richard H. Hall 
and Ray Fowler:

http://www.ufocasebook.com/minotafb.html

The web page also contains a minot.af.mil article called 
“Minot Air Force Base, History.”

“Minot, North Dakota” (City-Data.com):

http://www.city-data.com/city/Minot-North-Dakota.html

Map of Minot, North Dakota (city-data.com image)