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Start Over You searched for: Author Public Roads Bureau Remove constraint Author: Public Roads Bureau Catalog Issue Year Decade 1920 - 1929 Remove constraint Catalog Issue Year Decade: 1920 - 1929

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103. Tile-trenching machinery; [by D. L. Yarnell].

104. Irrigation of alfalfa: [by Samuel Fortier].

108. Drainage of irrigated farms; [by R. A. Hart].