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Year 1920 Remove constraint 1920: 1920 Collections Organic Roots Collection Remove constraint Organic Roots Collection: Organic Roots Collection
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1. How to detect outbreaks of insects and save the grain crops

Description:
Title from title screen (viewed Dec. 3, 2010).
Author:
Walton, William Randolph 1873-1952
Subject:
Grain , Diseases and pests , grain crops , crop entomology , plant pests
Collection:
Organic Roots Collection
Year:
1920