The Online Books Page

Books by Geddes W. Simpson:

Books in the extended shelves:

• Simpson, Geddes W.: Aphids and their relation to the field transmission of potato virus diseases in northeastern Maine (Maine Agricultural Experiment Station, 1940) (page images at HathiTrust)
• Simpson, Geddes W.: Biology of the foxglove aphid in the Northeastern United States (U.S. Dept. of Agriculture, 1965), also by H. E. Wave and Wayland Arthur Shands (page images at HathiTrust)
• Simpson, Geddes W.: Canada plum, Prunus nigra Aiton, as a primary host of the green peach aphid, Myzus persicae (Sulzer), in northeastern Maine (Maine Agricultural Experiment Station, 1969), also by Wayland Arthur Shands and H. E. Wave (page images at HathiTrust)
• Simpson, Geddes W.: Effects of cultural methods for controlling aphids on potatoes in northeastern Maine (Life Sciences and Agriculture Experiment Station, University of Maine at Orono, 1972), also by Wayland Arthur Shands and H. J. Murphy (page images at HathiTrust)
• Simpson, Geddes W.: Fewer applications of DDT with proper timing produce equal yields of potatoes at less cost (Maine Agricultural Experiment Station, 1954), also by Wayland Arthur Shands (page images at HathiTrust)
• Simpson, Geddes W.: Importance of entomogenous fungi in controlling aphids on potatoes in northeastern Maine (Maine Agricultural Experiment Station, 1963), also by Wayland Arthur Shands and I. M. Hall (page images at HathiTrust)
• Simpson, Geddes W.: Insecticidal control of potato infesting aphids in northeastern Maine (Life Sciences and Agriculture Experiment Station,University of Maine, 1976), also by R. H. Storch (page images at HathiTrust)
• Simpson, Geddes W.: Maine potato diseases, insects, and injuries (Maine Agricultural Experiment Station, 1949), also by Donald Folsom and Reiner Bonde (page images at HathiTrust)
• Simpson, Geddes W.: Procedure in field testing potato seedlings for leafroll resistance (Maine Agricultural Experiment Station, 1952) (page images at HathiTrust)
• Simpson, Geddes W.: Progress on insect and disease problems of potatoes in Maine, biology and control of aphids (Maine Agricultural Experiment Station, 1962), also by Wayland Arthur Shands (page images at HathiTrust)
• Simpson, Geddes W.: Progress on some important insect and disease problems of Irish potato production in Maine (Maine Agricultural Experiment Station, 1949), also by Wayland Arthur Shands (page images at HathiTrust)
• Simpson, Geddes W.: Seasonal history of the buckthorn aphid and suitability of alder-leaved buckthorn as a primary host in northeastern Maine (Life Sciences and Agriculture Experiment Station, University of Maine at Orono, 1971), also by Wayland Arthur Shands (page images at HathiTrust)
• Simpson, Geddes W.: Survey of internal parasites of potato-infesting aphids in Northeastern Maine, 1963 through 1969 (Life Sciences and Agriculture Experiment Station, University of Maine at Orono, 1972), also by Wayland Arthur Shands and Corinne C. Gordon (page images at HathiTrust)

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