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zhu xi zhi wu zhi - Gan, Qiliang (hu bei chang jiang chu ban ji tuan hu bei ke xue ji shu chu ban she, 2005)

Zilke's plants, trees, shrubs, bulbs, evergreens, roses : 1958 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Zilke Brothers Nursery, 1958)

Zilke's plants, trees, shrubs, bulbs, evergreens, roses : 1957 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Zilke Brothers Nursery, 1957)

Zilke's plants, trees, shrubs, bulbs, evergreens, roses : 1956 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Zilke Brothers Nursery, 1956)

Zoogeography - Hubbs, Carl L. (Carl Leavitt), 1894 -1979 (1958)

Zoologische Studien auf Capri - Eimer, Theodor, 1843 -1898 (W. Engelmann, 1873)

The Zoologist : a monthly journal of natural history (1911)