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

Nathanael Greene —
Photo Credit: By Charles Willson Peale - Public Domain, https://commons.wikimedia.org/w/index.php?curid=1722820

Alexander Hamilton — cropped from portrait by John Trumbull 1806
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=870421

Gilbert du Motier Marquis de Lafayette —
Photo Credit: By Joseph-Désiré Court - Public Domain, https://commons.wikimedia.org/w/index.php?curid=12059524