Year book - Carnegie Institution of Washington - Carnegie Institution of Washington (Carnegie Institution of Washington, 1905)

Yearbook of agriculture - United States. Department of Agriculture. (U.S. Govt. Print. Off, 1894)

Yearbook of agriculture - United States. Department of Agriculture. (U.S. Govt. Print. Off, 1896)

Yearbook of agriculture - United States. Department of Agriculture. (U.S. Govt. Print. Off, 1897)

Yearbook of the United States Department of Agriculture - United States. Department of Agriculture. (G.P.O, 1895)

Yield and quality of some grass-legume mixtures in response to N, P, and K fertilizers in the central interior of British Columbia - Broersma, Klaas. (Research Branch, Agriculture Canada, 1989)

Young's Point Provincial Park and Williamson Provincial Park management plan - Alberta. Alberta Community Development. (Alberta Community Development, Parks and Protected Areas, 2003)

zai pei zhi wu ming lu - Zhongguo ke xue yuan. Zhi wu yan jiu suo (zhong guo ke xue yuan)

Zeitschrift für Pflanzenzüchtung - Bayerischer Saatzuchtverein. (Paul Parey, 1921)

Zeitschrift für Pflanzenzüchtung - Bayerischer Saatzuchtverein. (Paul Parey, 1918)

Zeitschrift für Botanik (1915)

Zeitschrift für Pflanzenkrankheiten (E. Ulmer, 1891)

zhong guo bei bu he xi bei bu zhong yao si liao zhi wu he du hai zhi wu - Cui, Youwen. (gao deng jiao yu chu ban she)

zhong guo jing ji zhi wu bing yuan mu lu - Dai, Fanglan, Xiang Wangnian & Zheng Ruyong (ke xue chu ban she, 1958)

zhong guo zhu yao zhi wu tu shuo dou ke - Zhongguo ke xue yuan. Zhi wu yan jiu suo (ke xue chu ban she, 1955)

Zoe:a biological journal (Zoe Publishing Co, 1893)

Les zoocécidies des plantes d'Europe et du bassin de la Méditerranée. Description des galles - Houard, Clodomir, 1873 - (A. Hermann, 1909)

Zoologica (Erwin Nägele, 1911)

Zur Flora der grossen Kapela. [Eine botanische Wanderung um Bihac in Bosnien und in angrenzenden Theile von Croatien] - Boller, A. Adolf. (1893)

Zur Flora der Umgebung Lembergs - Tomaschek, Anton, 1826 -1891 (s.n, 1866)

Zur pilzflora Niederösterreichs - Beck, Günther. ([s.n.], 1880)