11Thomas Jefferson to John Adams, 21 March 1819 (Jefferson Papers)
books; on mathematics [index entry]
12Thomas Jefferson to Robert Patterson, 14 March 1819 (Jefferson Papers)
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13George Blackburn to Thomas Jefferson, 8 March 1819 (Jefferson Papers)
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14Robert Patterson to Thomas Jefferson, 6 March 1819 (Jefferson Papers)
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15John Adams to Thomas Jefferson, 19 February 1819 (Jefferson Papers)
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16Fernagus De Gelone to Thomas Jefferson, 28 January 1819 (Jefferson Papers)
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17Thomas Jefferson to Fernagus De Gelone, 22 January 1819 (Jefferson Papers)
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18Fernagus De Gelone to Thomas Jefferson, 7 January 1819 (Jefferson Papers)
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19Thomas Jefferson to Fernagus De Gelone, 27 December 1818 (Jefferson Papers)
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20Thomas Jefferson to Lewis D. Belair, 9 December 1818 (Jefferson Papers)
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