Note 97 — Chapter X · THE BALANCE BETWEEN SUPPLY AND REMOVAL OF MINERAL PLANT NUTRIENTS.
Reading edition
The latest authoritative statement is that the average annual rainfall of the United States is 29.4 inches; see: Water Resources, by W. J. McGee, vol. 1, p. 39-49, and Distribution of rainfall, by Henry Gannett, vol. 2, p. 10-12, Report of the National conservation commission, Senate doc. No. 676, 60th Congress, 2d session, 1909.