Browsing Agricultural Experiment Station -- Circulars of Information by Subject "Pear -- Diseases and pests -- Integrated control -- Oregon -- Hood River Valley"
Browsing Agricultural Experiment Station -- Circulars of Information by Subject
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Browsing Agricultural Experiment Station -- Circulars of Information by Subject "Pear -- Diseases and pests -- Integrated control -- Oregon -- Hood River Valley"
Oregon State University. Agricultural Experiment Station; Zwick, R. W. (Robert Ward), 1922-; Fields, G. J.([Corvallis, Or.] : Agricultural Experiment Station, Oregon State University, 1977-04)