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You searched for: “astronomy; astronomical instruments”
Results 1-3 of 3 sorted by date (ascending)
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1Thomas Jefferson to Henry A. S. Dearborn, 15 November 1811 (Jefferson Papers)
astronomy; astronomical instruments [index entry] 
2Thomas Jefferson to Bishop James Madison, 29 December 1811 (Jefferson Papers)
astronomy; astronomical instruments [index entry] 
3Thomas Cooper to Thomas Jefferson, 15 April 1819 (Jefferson Papers)
astronomy; astronomical instruments [index entry]