Sentinels of the Airways: Montana's Airway Beacon System, 1934-1979 MPS (NRIS 100004022)

• Canyon Resort Airways Beacon (Dillon)
• Homestake Airway Beacon (Butte)
• Silver Bow Airway Beacon (Ramsay)
• Spokane Hill Airway Beacon (Winston)
• St. Regis Airway Beacon (St. Regis)
• Whitetail Airway Beacon (Whitehall)

National Park Service documentation: https://npgallery.nps.gov/AssetDetail/NRIS/100004022