How the United States improved its agriculture
Christensen, R.P., Hendrix, W.E., Stevens, R.D.
How the United States improved its agriculture - Washington 1964 - 1-32 p. - Agriculture United States Department of Agriculture, Economic Research Service. Foreign ERS No. 76 .
How the United States improved its agriculture - Washington 1964 - 1-32 p. - Agriculture United States Department of Agriculture, Economic Research Service. Foreign ERS No. 76 .