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Filtering by: Publisher Corvallis, OR : Cooperative Extension work in Agriculture and Home Economics, Oregon State College and U.S. Dept. of Agriculture cooperating, Dept. of Agri. Eng. Remove constraint Publisher: Corvallis, OR : Cooperative Extension work in Agriculture and Home Economics, Oregon State College and U.S. Dept. of Agriculture cooperating, Dept. of Agri. Eng. Creator Oregon State College. Federal Cooperative Extension Service Remove constraint Creator: Oregon State College. Federal Cooperative Extension Service Subject Cattle guards -- Designs and plans Remove constraint Subject: Cattle guards -- Designs and plans

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