 | Agricultural pollution United States Congresses. | (2) |
 |
 | Agriculture's role in environmental quality : proceedings of the first Allerton conference, December, 1970. Allerton Conference on Agriculture's Role in Environmental Quality (1st : 1970 : Monticello, Ill.) 4n : Council on Environmental Quality, University of Illinois at Urbana-Champaign | |
| Environmental quality and agriculture, what are the options? proceedings of the second Allerton conference, December 1971. Allerton Conference on Agriculture and Environmental Quality (2nd : 1971 : Monticello, Ill.) 4n : Council on Environmental Quality, University of Illinois at Urbana-Champaign | |
|