Title: Correspondence
Subjects: Correspondence, Botanical specimens, Euphorbiaceae, Fagaceae, Juglandaceae, Umbelliferae, Convovulaceae, Liliaceae, Vitaceae, Identification, Yucca, Pinaceae, Chenopodiaceae
People: Sereno Watson (1826-1892), George W. Letterman (1840-1913), George Engelmann (1809-1884), Asa Gray (1810-1888), J. Reverchon (1836-1905)