Répertoire des noms génériques mentionnés dans l'Index kewensis et ses quinze premiers suppléments = Guide to the generic names appearing in the Index Kewensis and its fifteen supplements = Repertorio de los nombres genericos enumerados en el Index Kewensis y sus quince suplementos = Repertorium der im Index Kewensis und seinen fuenfzehn ersten Supplementen erwaehnten Gattungsnamen - Rouleau, Ernest 1916 -1991 (Châtelain, 1981)

Report of the State Botanist - Peck, Charles H. (Charles Horton), 1833 -1917 (University of the State of New York, 1916)

Report on the conservation status of Astragalus barrii, a candidate threatened species - Montana Natural Heritage Program. (Montana Natural Heritage Program, 1990)

Report on the conservation status of Astragalus scaphoides, a candidate threatened species - Lesica, Peter. (Montana Natural Heritage Program, 1984)

Report on the conservation status of Penstemon lemhiensis, a candidate threatened species : Montana - Montana Natural Heritage Program. (Montana Natural Heritage Program, 1990)

Report on the conservation status of Silene spaldingii, a candidate threatened species - Montana Natural Heritage Program. (Montana Natural Heritage Program, 1988)

Report on the progress and condition of the United States National Museum - United States National Museum (U.S. Govt. Print. Off, 1924)

Report on the progress and condition of the United States National Museum - United States National Museum (U.S. Govt. Print. Off, 1925)