Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 2003)

Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 2003)

Index to grass species - Smithsonian Institution (G. K. Hall, 1962)

Index to grass species - Smithsonian Institution (G. K. Hall, 1962)

Index to grass species - Smithsonian Institution (G. K. Hall, 1962)