- The Fersen Society
- Society information includes family details, resources, letters and diary, portraits, links, contact facts, news updates and media guide.
- French Deism
- Online encyclopedia of philosophy which contains articles about Voltaire, Encyclopedists, and Rousseau.
- Memoir of Leonard Covington
- This site publication contains information about Leonard Covington, articles, letters and other important facts.
- The Travels of William Bartram
- The official site of the Bartram Trail Conference, Inc. which also contains news, heritage facts, discoveries, links, event details, and more.
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