William Siri

American conservationist

American lawyer and conservationist

American children's book author and illustrator

American bird illustrator and conservationist

American university professor, zoologist, herpetologist, conservationist

American conservationist

American historian and a leader in the field of historic preservation

American conservationist, leading figure in the Montana conservation movement

Preservationist, civic leader

American physical chemist, engineer and conservation scientist

American conservationist

American politician and judge

Conservationist

American lawyer and conservationist

American conservationist

American conservationist

American writer, humorist, fisherman, environmentalist and conservationist

American ornithologist and conservationist

American art historian

American chemical engineer, businessperson, and preservationist