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agricultural educationagricultural engineeringagricultural implementsagricultural machineryagricultural machinery--maintenance and repairagricultural mechanicsagricultural surveysagricultureanvilsautomobilesavery companybarnsblacksmithingbriquets (fuel)caterpillar tractor companycaterpillar tractorscattle--housingcementcombines (agricultural machinery)contestscorncorn picking machinerycorn planters (machines)corn--gradingcorn--harvesting--machinerycornstalksculvertsdairy barnsdavidson, j. brownlee (jay brownlee), 1880-1957deere & companydirt roadsditchesdouble power mill companydraft animalsdraft horsesdrainagedrawing-room practicedrills (planting machinery)dynamometerengineeringengineering drawingsenginesfabrikant, michaelfarm enginesfarm equipmentfarm mechanizationfarm toolsfarm tractorsfarm trucksfarmsfertilizer spreadersfletcher, l. j.forge shopsfuller & johnson manufacturing companygrain elevatorsgrain--harvestinggravel roadshansen, edwin leroy, 1911-harrowsharvestinghistoric sitesholt manufacturing companyhorsepowerhorsesihc tractorsinternal combustion enginesinternational congress of rural engineeringinternational harvester companyiowa state universityiowa state university. agricultural and biosystems engineering departmentiowa state university. department of agricultural engineeringirrigationj.i. case companyjewish diasporajewish refugeesmasonrymaterials--deteriorationmccolly, h. f. (howard franklin), 1902-1996measuring instrumentsnorthwest thresher companyoatsphotographsplowsrailroadsriceroads--design and constructionroofingsawmillsshovelssilage machinerysilossteamboatsstone, archie augustus, 1893-studentssurveyingtechnical drawingterracingthreshing machinestractorstravelsveishea (festival)vocational school studentswagonswater-supplyweatheringwilson, m. l.wind powerwindmills