1Andrew Smith to Thomas Jefferson, 16 April 1821 (Jefferson Papers)
building materials; cement, Roman [index entry]
2Enclosure: Circular on Roman Cement, [before 16 April 1821] (Jefferson Papers)
building materials; cement, Roman [index entry]
3Andrew Smith to Thomas Jefferson, 31 July 1821 (Jefferson Papers)
building materials; cement, Roman [index entry]