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An improved method of artificial pollination in corn. By G.N. Collins and J.H. Kempton. by Series: United States. Dept. of Agriculture. Bureau of Plant Industry. Circular ; no. 89
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Washington, Govt. Print. Off., 1912
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2.
Using honey bees to pollinate crops. by Series: Leaflet (United States. Department of Agriculture) ; no. 549.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: [Washington, U.S. Govt. Print. Off., 1968]
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