Machine processing of remotely sensed data with special emphasis on crop inventory and monitoring : eighth international symposium, July 7-9, 1982, Purdue University, Laboratory for Applications of Remote Sensing, West Lafayette, Indiana / edited by D.C. McDonald and D.B. Morrison.
Proceedings of the Third International Conference on Precision Agriculture : June 23-26, 1996, Minneapolis, Minnesota / editors P.C. Robert, R.H. Rust, and W.E. Larson ; conducted by the Precision Agriculture Center, Department of Soil, Water, and Climate, University of Minnesota.