Whitney, J. D., Q. Ling, T. A. Wheaton, and W. M. Miller. 1999. A DGPS yield monitoring system for Florida citrus. AppliedEngmneering in Agriculture 17(2): 115-119. Whittaker, A. D., G. E. Miles, O. R. Mitchell, and L. D. Gaultney. 1987. Fruit location in a partially occluded image. Transactions of the ASAE 30(3): 591-597. Wilkerson, J. B., J. S. Kirby, W. E. Hart, and A. R. Womac. 1994. Real-time cotton flow sensor. ASAE Paper No. 94-1054. St. Joseph, MI.: ASAE.