RT Book, Whole DB /z-wcorg/ DS http://worldcat.org ID 9035990 LA English T1 Progress of solar technology and potential farm uses A1 Heid, Walter George,, Trotter, Warren K., United States., Department of Agriculture., Economic Research Service., PB U.S. Dept. of Agriculture, Economic Research Service : For sale by the Supt. of Docs., U.S. G.P.O. PP Washington, D.C. YR 1982