Rare native plants of Massachusetts - Massachusetts. Division of Fisheries; Wildlife. (Massachusetts Division of Fisheries and Wildlife, 1985)

Rare native plants of Massachusetts - Massachusetts. Division of Fisheries; Wildlife. (Division of Fisheries and Wildlife, 1989)

Rare plant inventory of the outstanding natural areas of the Rocky Mountain Front - United States. Bureau of Land Management. (Montana Natural Heritage Program, 1988)

A rare plant survey of the Wainwright Dunes Ecological Reserve - Alberta. Alberta Sustainable Resource Development. (Alberta Sustainable Resource Development, Resource Data Branch, Public Lands Division, 2003)

Rare plants of the Ozark Plateau : a field identification guide - North Central Forest Experiment Station (Saint Paul, Minn.) (North Central Forest Experiment Station, Forest Service, U.S.D.A, 1978)

Reading Naturalist. Reading - Reading Natural History Society.

The Reading Nursery - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Reading Nursery, 1898)

Realizing nature's potential : proceedings of the William L. Brown Symposium honoring Dr. Gordon Cragg - Miller, James Stuart, 1953 - (Missouri Botanical Garden, 2011)

Recognizing plant families of the west : field guide - United States. Bureau of Land Management. (U.S. Department of the Interior, Bureau of Land Management, 2021)

Record of decision and Lake Havasu Field Office approved resource management plan - United States. Bureau of Land Management. (U.S. Department of the Interior, Bureau of Land Management, Lake Havasu Field Office, 2007)

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Records of the Auckland Institute and Museum - Auckland Institute; Museum. (Auckland Institute and Museum, 1942)

Records of the Auckland Institute and Museum - Auckland Institute; Museum. (Auckland Institute and Museum, 1948)

Records of the Auckland Institute and Museum - Auckland Institute; Museum. (Auckland Institute and Museum, 1980)

Records of the Auckland Institute and Museum - Auckland Institute; Museum. (Auckland Institute and Museum, 1984)

Records of the Auckland Institute and Museum - Auckland Institute; Museum. (Auckland Institute and Museum, 1994)

Records of the Botanical Survey of India - Botanical Survey of India. (Office of Supt. of Govt. Print., India, 1893)

Records of the Botanical Survey of India - Botanical Survey of India. (Office of Supt. of Govt. Print., India, 1902)

Records of the Botanical Survey of India - Botanical Survey of India. (Office of Supt. of Govt. Print., India, 1912)

Records of the Botanical Survey of India - Botanical Survey of India. (Office of Supt. of Govt. Print., India, 1953)

Records of the Queen Victoria Museum Launceston - Queen Victoria Museum (Launceston, Tas.) (The Museum, 1966)

Records of the Queen Victoria Museum Launceston - Queen Victoria Museum (Launceston, Tas.) (The Museum, 1969)

Records of the Queen Victoria Museum Launceston - Queen Victoria Museum (Launceston, Tas.) (The Museum, 1977)

Records of the Queen Victoria Museum Launceston - Queen Victoria Museum (Launceston, Tas.) (The Museum, 1979)

Records of the Queen Victoria Museum Launceston - Queen Victoria Museum (Launceston, Tas.) (The Museum, 1984)

Records of the Queen Victoria Museum Launceston - Queen Victoria Museum (Launceston, Tas.) (The Museum, 1996)

Records of the Queen Victoria Museum Launceston - Queen Victoria Museum (Launceston, Tas.) (The Museum, 2003)

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Reise durch die Wueste Atacama :auf Befehl der chilenischen Regierung im Sommer 1853-54 - Philippi, Rodolfo Amando, 1808 -1904 (E. Anton, 1860)

Reise durch Nord-Amerika bis zur Mündung des grossen Fischflusses und an des Küsten des Polarmeeres in den Jahren 1833, 1834 und 1835 - Back, George, 1796 -1878 (J.J. Weber, 1836)

Reise in den äussersten Norden und Osten Sibiriens während der Jahre 1843 und 1844 mit Allerhöchster Genehmigung auf Veranstaltung der Kaiserlichen Akademie der Wissenschaften zu St. Petersburg ausgeführt und in Verbindung mit vielen Gelehrten - Imperatorskai︠a︡ akademīi︠a︡ nauk (Russia) (Buchdr. der K. Akademie der Wissenschaften : Zu haben bei Eggers, 1856)

Reise in Ostafrika in den Jahren 1903-1905 : mit Mitteln der Hermann und Elise geb. Heckmann Wentzel-Stiftung : Wissenschaftliche Ergebnisse - Voeltzkow, Alfred, 1860 -1946 (E. Schweizerbartsche Verlagsbuchhandlung, 1917)

Reisen in Amur-Land und auf der Insel Sachalin : im Auftrage der Kaiserlich-Russischen Geographischen Gesellschaft ausgefuehrt - Schmidt, Friedrich, 1832 -1908 (Commissionaires de l'Académie impériale des sciences, 1868)

Reisen nach dem Nordpolarmeer in den Jahren 1870 und 1871 - Heuglin, Theodor von, 1824 -1876 (G. Westermann, 1874)

Reliquiae Dewevreanae ou Enumération systématique des plantes récoltées par Alfr. Dewèvre en 1895-96 dans l'Etat Indépendant du Congo - De Wildeman, Emile 1866 -1947 (1901)

Reliquiae Formánekianae : enumeratio critica plantarum vascularium, quas itineribus in Haemo Peninsula et Asia Minore (Bithynia) factis collegit Dr. Ed. Formánek - Vandas, Karel, 1861 -1923 (Comitiorum Marchionatus Moraviae, 1909)

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)