UFO Case Directory:
“The Night NORAD Went On Top Alert,
October 1975, Cheyenne Mountain, Colorado”
(NICAP.org)
This is a case directory pertaining to the October and November 1975 UFO incidents that occurred over Malmstrom Air Force Base (Montana), Wurtsmith Air Force Base (Michigan, not New Hampshire) and Loring Air Force Base (Maine):
http://www.nicap.org/noraddir.htm
Aerial view of Malmstrom Air Force Base,
Great Falls, Montana (wikimedia.org)
(wikimedia.org photo)