-
by Burroughs, Raymond Darwin, 1899-
Published 1961 -
by Steward, Albert Newton, 1897-
Published 1960 -
Manual of the botany (Phænogamia and Pteridophyta) of the Rocky Mountain regionfrom New Mexico to the British boundaryBookby Coulter, John Merle, 1851-1928
Published 1885 -
by Hatch, Melville Harrison, 1898-1988
Published 1949 -
by Gannett, Henry, 1846-1914
Published 1905 -
by Hess, Harry Hammond, 1906-1969
Published 1960