Lindbergh departs on historic flight — Nearly a thousand people assembled at Roosevelt Field to see Charles Lindbergh off on his historic flight. Underwood and Underwood.
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=25262069

Charles Lindbergh —
Photo Credit: By Harris & Ewing - Public Domain, https://commons.wikimedia.org/w/index.php?curid=9752054

cover, Our National Parks —
Photo Credit: https://www.amazon.com/Our-National-Parks-Mountains-wilderness/dp/1984152122

A Thousand-Mile Walk to the Gulf —
Photo Credit: https://www.amazon.com/Thousand-Mile-Walk-Gulf-John-Muir-ebook/dp/B07B6K1MX8

Muir's birthplace — Muir was born in the small house at left. His father bought the adjacent building in 1842, and made it the family home.
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=10671649

Entrance to Fountain Lake Farm near Portage, WI —
Photo Credit: By User Royalbroil on en.wikipedia - Self-photographed, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=1783751

Theodore Roosevelt and Muir, 1906 —
Photo Credit: By Underwood & Underwood - Public Domain, https://commons.wikimedia.org/w/index.php?curid=3517191

Yosemite Park plaque — commemorates John Muir and Theodore Roosevelt camping trip
Photo Credit: https://www.scenicwonders.com/blog/presidents-yosemite

John Muir —
Photo Credit: By Francis M. Fritz - Public Domain, https://commons.wikimedia.org/w/index.php?curid=266893

Logo of Sierra Club — An environmental organization with chapters in all 50 United States, Washington D.C., and Puerto Rico.
Photo Credit: By Source (WP:NFCC#4), Fair use, https://en.wikipedia.org/w/index.php?curid=49935019

1st edition, Motivation and Personality —
Photo Credit: By Source, Fair use, https://en.wikipedia.org/w/index.php?curid=48955365