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GopalaPillai, S., Tian, L. and Beal, J. (1998).  Detectionion of Nitrogen Stress in Corn Using Digital Aerial Imaging.  Presented at the July 12-16, 1998 ASAE Annual International Meeting, Paper No. 983030,ASAE, 2950 Niles Road, St. Joseph, MI 49085-9659 USA.  Available:

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Russo, J., and Dantinne, J., (1997). Seeing the Trees and the Forest, PrecisionAG Illustrated, July-August 1997 / Vol. 1, No. 4: 31-32

Ryerson, R.A., Curran, P.J. and Stephens, P.R., (1997).  Agriculture, p. 381. In Manual of Photographic Interpretation, Second Edition, American Society for Photogrammetry and Remote Sensing.

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