Illinois crop yields from soil experiment fields
Hopkins, Cyril G.
Illinois crop yields from soil experiment fields - Urbana 1919 - 395-503 p. - Crop, Yields, Soil, Experiments Illinois Agricultural Experiment Station. Bulletin No. 219 .
Illinois crop yields from soil experiment fields - Urbana 1919 - 395-503 p. - Crop, Yields, Soil, Experiments Illinois Agricultural Experiment Station. Bulletin No. 219 .