1Thomas Jefferson to Bernard Peyton, 18 September 1819 (Jefferson Papers)
building materials; cement [index entry]
2Thomas Jefferson to Bernard Peyton, 7 February 1822 (Jefferson Papers)
building materials; cement, Roman [index entry]
3Thomas Jefferson to Bernard Peyton, 15 February 1822 (Jefferson Papers)
building materials; cement, Roman [index entry]
4Thomas Jefferson to Bernard Peyton, 12 August 1822 (Jefferson Papers)
building materials; cement, Roman [index entry]