Records of the Western Australian Museum - Western Australian Museum (Western Australian Museum, 1985)

Records of the Western Australian Museum - Western Australian Museum (Western Australian Museum, 1995)

Recueil des travaux botaniques néerlandais - Koninklijke Nederlandse Botanische Vereniging. (Société botanique néerlandaise, 1904)

Red list of the endemic plants of the Caucasus : Armenia, Azerbaijan, Georgia, Iran, Russia, and Turkey - Missouri Botanical Garden. (Missouri Botanical Garden Press, 2014)

Reevaluation of vegetational characteristics at the CERC Field Research Facility, Duck, North Carolina - Coastal Engineering Research Center (U.S.). Field Research Facility. (The Center, 1983)

Regiones terrestres prioritarias de México - Aguilar Zúñiga, Claudia (Comisión Nacional para el Conocimiento y Uso de la Biodiversidad (CONABIO), 2000)

Règles internationales de la nomenclature botanique adoptées par le Congrès international de botanique de Vienne, 1905 = International rules of botanical nomenclature adopted by the International Botanical Congresses of Vienna, 1905 and Brussels, 1910 = Internationale Regeln der botanischen Kongressen zu Wien 1905 und Bruüssel 1910 - Briquet, John, 1870 -1931 (G. Fischer, 1912)

Reisen in Süd-Arabien, Mahra-land und Hadramt - Hirsch, Leo. (E.J. Brill, 1897)

The relation of pheasants to agriculture in the Yellowstone and Big Horn River valleys of Montana - Hiatt, Robert W. (Montana State Fish and Game Commission, Wildlife Restoration Division, 1947)

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)