Helicopter rotor Mil Mi-24, Mi-35
Mil Mi-8 - Wikipedia
Mil V-12 helicopter - development history, photos, technical data
Hispano Aviación HA-1112 - Wikipedia
Mil Mi-26 - Wikipedia
File:Mil Mi-12 aug 2008 1.jpg - Wikimedia Commons
The Mil V-12: The Largest Helicopter Ever Built
Mil Mi-6 - Wikipedia
Mil Mi-26 - Wikipedia