Phosphorus and humus in relation to Illinois soils
By: by Cyril G. Hopkins
Series: Circular / University of Illinois (Urbana-Champaign campus). Agricultural Experiment Station -- no. 116; Circular (University of Illinois (Urbana-Champaign campus). Agricultural Experiment Station) -- no. 116
Publisher: University of Illinois Agricultural Experiment Station
Published: 1908
Place of publication: Urbana, Ill
Language: eng
Number of pages: 27
Subjects: Soil fertility; Humus; Soils; Phosphorus content
Notes: Caption title.

"An address read before the Illinois State Farmers' Institute at Peoria, February 12, 1908"--P. 1