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

Maslow's hierarchy of needs —
Photo Credit: By Androidmarsexpress - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=93026655

Bascom Hall, UW Madison — atop Bascom Hill at the heart of the campus
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=1040009

seal of University of Wisconsin-Madison —
Photo Credit: By University of Wisconsin-Madison - Public Domain, https://commons.wikimedia.org/w/index.php?curid=44638876

Abraham Maslow —
Photo Credit: By Source, Fair use, https://en.wikipedia.org/w/index.php?curid=34062949

General John Burgoyne — engraving by S. Hellyer, 1860
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=74605522