George Corsan, Sr. - ISHOF

Developed YMCA swimming programs; Head instructor of the International and National YMCA's; originated mass method of swimming instruction.

The Butterfly: A Complex History for a Complex Stroke

Butterfly stroke - Wikipedia

IAHSFF 2012_Book - Flip eBook Pages 51-100

International Swimming Hall of Fame – Wikipedia

Happy 80th Birthday Lance Larson - Sub-Minute Butterfly Pioneer Who Triggered The Timepad - Swimming World News

IAHSFF 2012_Book - Flip eBook Pages 51-100

George Corsan, Sr. - ISHOF

Plunge for distance - Wikipedia

The Butterfly: A Complex History for a Complex Stroke

Happy 80th Birthday Lance Larson - Sub-Minute Butterfly Pioneer Who Triggered The Timepad - Swimming World News

Plunge for distance - Wikipedia

Shedding Fresh Light on the History of the Butterfly Stroke (Chapter 2) - As If By Design

Happy 80th Birthday Lance Larson - Sub-Minute Butterfly Pioneer Who Triggered The Timepad - Swimming World News