Land availability, crop production, and fertilizer requirements in the United States /

Prepared for U. S. Environmental Protection Agency. Office of Solid Waste Management Programs.

High-extraction coal mining in Illinois : effects on crop production, 1985-1987 /

"IMSRP-IV."

The chemistry of crop production,

Mode of access: Internet.

Manuring for higher crop production.

Bibliographical foot-notes.