11Thomas Jefferson to Patrick Gibson, 26 July 1821 (Jefferson Papers)
building materials; cement, Roman [index entry]
12Bernard Peyton to Thomas Jefferson, 21 February 1822 (Jefferson Papers)
building materials; cement, Roman [index entry]
13Bernard Peyton to Thomas Jefferson, 11 February 1822 (Jefferson Papers)
building materials; cement, Roman [index entry]
14Bernard Peyton to Thomas Jefferson, 19 August 1822 (Jefferson Papers)
building materials; cement, Roman [index entry]
15Bernard Peyton to Thomas Jefferson, 28 July 1819 (Jefferson Papers)
building materials; cement, Roman [index entry]
16Martha Jefferson Randolph to Thomas Jefferson, 7 August 1819 (Jefferson Papers)
building materials; cement, Roman [index entry]
17Enclosure: Richard Randolph’s Directions for Making Cement, [ca. 10 April 1822] (Jefferson Papers)
building materials; cement, Roman [index entry]
18Andrew Smith to Thomas Jefferson, 16 April 1821 (Jefferson Papers)
building materials; cement, Roman [index entry]
19Enclosure: Circular on Roman Cement, [before 16 April 1821] (Jefferson Papers)
building materials; cement, Roman [index entry]
20Andrew Smith to Thomas Jefferson, 31 July 1821 (Jefferson Papers)
building materials; cement, Roman [index entry]