Rush, Benjamin, 1746-1813.; Jefferson, Thomas, 1743-1826. and American Philosophical Society., 2005, An account of the sugar maple-tree, of the United States, and of the methods of obtaining sugar from it, together with observations upon the advantages both public and private of this sugar. : In a letter to Thomas Jefferson, Esq. secretary of state of the United States, and one of the vice presidents of the American Philosophical Society. : Read in the American Philosophical Society, on the 19, of August, 1791, and extracted from the third volume of their Transactions now in the press. / By Benjamin Rush, M.D. Professor of the institutes and of clinical medicine in the University of Pennsylvania., CLARIN DSpace, http://hdl.handle.net/20.500.14106/N19030.