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Fewer applications of DDT with proper timing produce equal fields of potatoes at less cost G.W. Simpson and W.A. Shands by Series: (maine Agricultural Experiment station bulletin; no.533)
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Orono University of Maine 1954
Availability: Items available for loan: CPRI Library (1)Call number: 635.212 9 SI58F.

2.
Progress on insect and disease problems of potatoes in Maine : biology and control of aphids G.W. Simpson and W.A. Shands by Series: (maine Agricultural Experiment station bulletin; no. 470)
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Orono University of Maine 1962
Availability: Items available for loan: CPRI Library (2)Call number: 635.212 7 SI58P, ...

3.
Progress on some important insect and disease problems of Irish potato production in Maine G.W. Simpson and W.A. Shands by Series: (maine Agricultural Experiment station bulletin; no. 470)
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Orono Maine Agricultural Experiment Station 1949
Availability: Items available for loan: CPRI Library (1)Call number: 635.212 7 SI58P.

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