Civilian Air Vehicles - Sikorsky S-38-A
Sikorsky S-38, Aircraft
AVIATION HISTORY PHOTO ESSAY. Early attempts at Flying, by Menaka Ashi Fernando
特選/公式 M´S GRACY 38
Sikorsky S-76 - Wikipedia
File:Sikorsky S-18 aircraft circa 1916.jpg - Wikipedia
Osa's Ark'- Sikorsky S-38 Original and Modern Replica (Info and source in comments) : r/WeirdWings
Fil:Sikorsky S-29A L'Aéronautique March,1927.jpg – Wikipedia
AVIATION HISTORY PHOTO ESSAY. Early attempts at Flying, by Menaka Ashi Fernando
Sikorsky S-92 - Wikipedia
Sikorsky S-42 - Wikipedia
File:Sikorsky S-38 1929 (20).JPG - Wikimedia Commons
Sikorsky S-61 - Wikipedia
Sikorsky S-52, Military Wiki