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Rocky Mountain front raptor survey, December 1982-August 1984 - U.S. Fish; Wildlife Service (Montana Dept. of Fish, Wildlife and Parks, 1984)

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Rodriguésia: Revista do Jardim Botânico do Rio de Janeiro (Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, 1980)

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Die rohstoffe des pflanzenreiches; versuch einer technischen rohstofflehre des pflanzenreiches - Wiesner, Julius, 1838 -1916 (W. Engelmann, 1903)

Die Rohstoffe des Pflanzenreichs : versuch einer Technischen Rohstofflehre des Pflanzenreiches - Wiesner, Julius, 1838 -1916 (W. Engelmann, 1918)

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Sand dunes and salt marshes - Townsend, Charles Wendell, 1859 -1934 (D. Estes & company, 1913)

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Seasonal biology of Anopheles, Culex and Culiseta in central Alberta (Diptera: Culicidae) - Hudson, James Edward. (University of Alberta, Dept. of Entomology, 1977)

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Select extra-tropical plants readily eligible for industrial culture or naturalisation, with indications of their native countries and some of their uses - Mueller, Ferdinand von, 1825 -1896 (Off. of the Superintendent of Government Printing, 1880)

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Sensitive plant survey in the Sioux District, Custer National Forest, Carter County, Montana, and Harding County, South Dakota - Montana Natural Heritage Program. (Montana Natural Heritage Program, 1995)

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sheng tai hua xue qian yan - kong chui hua lou yong gen (gao deng jiao yu chu ban she, 2010)

sheng tai xue ci dian - zhao tian zhen yi (tu jing zhuang yi lang, 1974)

sheng wu quan de di yi xing sheng chan li - Lieth, Herbert. (ke xue chu ban she, 1985)

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