Symposium: Managing nitrogen for groundwater quality and farm profitability Anaheim, C., Division A-5 American Society of Agronomy., S-1, S., Division C-3, C., Follett, R. F., Keeney, D. R., & Cruse, R. M. (1991). Proceedings. Estados Unidos de América: Soil Science Society of America, Inc..

Symposium: Managing nitrogen for groundwater quality and farm profitability Anaheim, California, Division A-5 American Society of Agronomy, S-3 S-1, C5 Division C-3, R. F. Follett, D. R. Keeney, and R. M. Cruse. Proceedings. Estados Unidos de América: Soil Science Society of America, Inc., 1991.

Symposium: Managing nitrogen for groundwater quality and farm profitability Anaheim, California, et al. Proceedings. Estados Unidos de América: Soil Science Society of America, Inc., 1991.