Soil improvement for the worn hill lands of illinois
Hopkins, C.G., Readhimer, J.E.
Soil improvement for the worn hill lands of illinois - Urbana 1907 - 431-443 p. - Soil, Lands Illinois Agricultural Experiment Station. Bulletin No. 115 .
Soil improvement for the worn hill lands of illinois - Urbana 1907 - 431-443 p. - Soil, Lands Illinois Agricultural Experiment Station. Bulletin No. 115 .