John Torrey letters, 1831-1873. Asa Gray correspondence files of the Gray Herbarium, 1820-1904. gra00078. Archives of the Gray Herbarium, Harvard University.
John Torrey letters, 1831-1873. Asa Gray correspondence files of the Gray Herbarium, 1820-1904. gra00078. Archives of the Gray Herbarium, Harvard University.