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Browsing Agricultural Experiment Station -- Bulletins / Station Bulletins by Author "Ewing, H. E. (Henry Ellsworth), b. 1883"

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Browsing Agricultural Experiment Station -- Bulletins / Station Bulletins by Author "Ewing, H. E. (Henry Ellsworth), b. 1883"

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  • The common red spider or spider mite 
    Oregon Agricultural College. Experiment Station; Ewing, H. E. (Henry Ellsworth), b. 1883 (Corvallis, Or. : Oregon Agricultural College. Experiment Station, 1914-08)

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