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Sikorsky S-61 - Wikipedia
Sikorsky SH-3 Sea King - Wikipedia
Sikorsky S-61 – Igor I Sikorsky Historical Archives - Sikorsky …
Sikorsky S-61 H-3 - Helis.com
Sikorsky S-61R - Wikipedia
Sikorsky S-61: From Naval Marvel to Sky's Ultimate Water Bomber
Sikorsky S-61/HH-3A Sea King - American Helicopter Museum
SIKORSKY S61N Specifications, Cabin Dimensions, Performance
Sikorsky S-61R - Price, Specs, Photo Gallery, History - Aero Corner
S61 Helicopter – National Helicopter Museum