How valuable are the soils of central Illinois :
a ten-year study of selected soils, systems of farming, and relative earnings /
by W.N. Thompson and P.E. Johnston.

APA Citation

Thompson, W. N. (William Neil)., Johnston, P. E. (Paul Evans). (1952). How valuable are the soils of central Illinois: a ten-year study of selected soils, systems of farming, and relative earnings. Urbana, Ill.: University of Illinois Agricultural Experiment Station.

MLA Citation

Thompson, W. N. (William Neil), and P. E. (Paul Evans) Johnston. How Valuable Are the Soils of Central Illinois: a Ten-year Study of Selected Soils, Systems of Farming, And Relative Earnings. Urbana, Ill.: University of Illinois Agricultural Experiment Station, 1952.

Warning: These citations may not always be complete (especially for serials).