1Thomas Jefferson to Smith & Riddle, 6 May 1819 (Jefferson Papers)
Kupfer, Charles F.; and Boston Glass Manufactory [index entry]
2Thomas Jefferson to Charles F. Kupfer, 15 June 1819 (Jefferson Papers)
Kupfer, Charles F.; and Boston Glass Manufactory [index entry]
3Thomas Jefferson to Smith & Riddle, 15 June 1819 (Jefferson Papers)
Kupfer, Charles F.; and Boston Glass Manufactory [index entry]
4John S. Foster to Thomas Jefferson, 23 June 1819 (Jefferson Papers)
Kupfer, Charles F.; and Boston Glass Manufactory [index entry]
5Thomas Jefferson to Charles F. Kupfer, 25 June 1819 (Jefferson Papers)
Kupfer, Charles F.; and Boston Glass Manufactory [index entry]