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Observations on the Biology and Control of the Treehopper Heliria Praealta (Fowler) in Orchards of the Pacific Northwest

Edgar John UdineEdmund Bryan LambertFrank Leslie DuleyJoseph Benjamin ShepherdM. A. YothersRobert Hale NelsonRussell Rutherford WhittenVictor Leo StedronskyWilliam Alvin DouglasArvid John JohnsonCarroll Clayton CassilLatimer Ludwig KellyPaul B. AllenThompson Elwyn WoodwardThomas Laffin Baggette

出版	U.S. Department of Agriculture, 1941
URL	http://books.google.com.hk/books?id=hFcEWugjoaAC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN