 | Virus diseases of plants. | (2) |
 |
 | The leafhopper vectors of phytopathogenic viruses (Homoptera, Cicadellidae) : taxonomy, biology, and virus transmission, / by M.W. Nielson. Nielson, Mervin William. 1n Washington : U.S. Dept. of Agriculture, 1968. | |
| Indexing procedures for 15 virus diseases of citrus trees / prepared by the Committee on Indexing Procedures, Diagnosis, and Nomenclature, Third Conference of International Organization of Citrus Virologists, Campinas and Säao Paulo, Brazil, 1963. Washington, D.C. : Agricultural Research Service, U.S. Dept. of Agriculture, 1968. | |
|