21Lewis D. Belair to Thomas Jefferson, 26 November 1818 (Jefferson Papers)
books; on mathematics [index entry]
22Fernagus De Gelone to Thomas Jefferson, 7 January 1819 (Jefferson Papers)
books; on mathematics [index entry]
23Fernagus De Gelone to Thomas Jefferson, 28 January 1819 (Jefferson Papers)
books; on mathematics [index entry]
24John Adams to Thomas Jefferson, 19 February 1819 (Jefferson Papers)
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25Robert Patterson to Thomas Jefferson, 6 March 1819 (Jefferson Papers)
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26George Blackburn to Thomas Jefferson, 8 March 1819 (Jefferson Papers)
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27Rodolph Schaer to Thomas Jefferson, 25 March 1819 (Jefferson Papers)
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28John Hyder to Thomas Jefferson, 14 July 1820 (Jefferson Papers)
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29Louis H. Girardin to Thomas Jefferson, 16 August 1820 (Jefferson Papers)
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30Claudius Crozet to Thomas Jefferson, 1 November 1821 (Jefferson Papers)
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