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1.
Procedures for screening and testing alfalfa for resistance to the alfalfa seed chalcid, by M. W. Nielson. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: [Washington] 1967
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2.
The leafhopper vectors of phytopathogenic viruses (Homoptera, Cicadellidae); taxonomy, biology, and virus transmission, by M. W. Nielson. by Series: Technical bulletin (United States. Department of Agriculture) ; no. 1382.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Washington, U.S. Agricultural Research Service; for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1968
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