Correspondence in this series:

Stevenson, J.A. 1932–1951; “S” Miscellaneous 1936–1963; Train, Agnes and Perry 1937–1957; Train, Perry - Nevada Train Original Plant Survey Prom. Species 1937; Train, Perry - Nevada Train Original Plant Survey Prom. Species 1938; Train, Perry - Nevada Train Original Plant Survey Prom. Species 1939; Train, Perry - Nevada Train Original Plant Survey Prom. Species 1940; Tropical Plant Research Foundation 1930–1931; “T” Miscellaneous 1945–1963; Verdoorn, F. 1941–1954; Walker, E.H. 1945–1956; Wherry, E.T. 1954–1957; Whitehouse, W.E. 1936–1941; Williams, L.O. 1962–1963; Woodson, R.E. 1950–1954; “U-V” Miscellaneous 1942–1955; “W-Z” Miscellaneous 1946–1962; Yuncker, T.G. 1942–1954