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xi an zhi wu zhi - Xie, Yintang, Wang Mali & Zhao Guifang (shan xi ke xue ji shu chu ban she, 2007)

Yield, use and chemical composition of forage in Elk Island National Park, Alberta - Bishoff, Kenneth Wayne, 1942 - (University of Alberta, 1981)

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Zeitschrift für Botanik (1915)

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Zeitschrift für die gesammten Naturwissenschaft - Naturwissenschaftlicher Verein für Sachsen und Thüringen in Halle. (Wiegandt, Hempel & Parey, 1860)