George Corsan, Sr. - ISHOF

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

Conceptual and Empirical Exploration

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

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

A long night's journey into day: the Odyssey of the butterfly stroke in international swimming - Document - Gale Academic OneFile

IAHSFF 2012_Book - Flip eBook Pages 51-100

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

2019 Yearbook_1PDF Pages 1-50 - Flip PDF Download

George Hebdon Corson - Etobicoke Historical Society

The Butterfly: A Complex History for a Complex Stroke