Airborne Mine Countermeasures		Igor I. Sikorsky Historical Archives		The Helicopter Museum
Aircav		Military Helicopters Overview		The Kaman K-Max
All The World's Rotorcraft		Military Helicopters Pictures		U.S. Army Attack Helicopters
Helicopter Blue Book		Penn State Rotorcraft Center of Excellence		U.S. Army Helicopter Photos
Helicopter History		Popular Rotorcraft Association		USMC/Vietnam Helicopter Association
Helicopter History Site		Rotorhub		Vertiflite
How Helicopters Work		Stanford U. - Hummingbird		Vietnam Helicopter Flight Crew Network
Historia		Swiss Helicopters		World Military Helicopters
		The Chinook "Wokka" Site