Note 121 — Chapter XI · THE ORGANIC CONSTITUENTS OF THE SOIL SOLUTION.
Reading edition
The fixation of atmospheric nitrogen by bacteria, by J. G. Lipman, Bull. 81, Bureau of Chemistry, U. S. Dept. of Agriculture, 1904, p. 146-160; A review of investigations in soil bacteriology, by Edward B. Voorhees and Jacob G. Lipman, Bull, 194, Office of Experiment Stations, U. S. Dept. of Agriculture, 1907.