TY  - BOOK
AU  - Simpson, G.W.
AU  - Shands, W.A
TI  - Progress on insect and disease problems of potatoes in Maine : biology and control of aphids
T2  - (maine Agricultural Experiment station bulletin; no. 470)
PY  - 1962///
CY  - Orono
PB  - University of Maine
ER  -