Search Results       Your search for [subject]Diffusion of innovations -- United States -- History returned 1 record.           The diffusion of the tractor in American agriculture : 1910-60. by Olmstead, Alan L.; Cambridge: National Bureau of Economic Research, 2000. Subject: Farm tractors -- United States -- History; Agriculture -- Economic aspects -- United States -- History; Diffusion of innovations -- United States -- History; Capital investments -- United States -- History.          Add to Book Cart Relevance: 26.81%