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lAandahl, A. R., 1972, Soils of the Great Plains. University of Nebraska,
Lincoln, Nebraska, 1 pp.
2powns, J. M., Murphy, J. D., and Thompson, D.R.; Use of Agro-Physical
Maps in Large Area Crop Inventories; 1976; 68th Annual Meeting, American
Society of Agronomy. Houston, Texas, November 28-December 2, 1976.
3MacDonald, R. B. and Hall, F.G.; 1977; LACIE: A Proof of Concept Experi-
ment in Global Crop Monitoring. NASA Report 07-00331, NASA/JSC, Houston,
Texas. 25 pp.
"Westin, F.C., 1976, Agrophysical Mapping, Final Report. Contract
'NAS9-15178. NASA/JSC, Houston, Texas.
SGruenberger, Fred, Critical Factors in Data Management, Prentice-Hall,
Inc., Englewood Cliffs, New Jersey, 1969, p. 127ff.
6Head, Robert V., Managers' Guide to Management Information Systems,
Prentice-Hall, Inc., Englewood Cliffs, New Jersey, 1976, p. 30ff.
7Final Technical Report, REMOTE SENSING USER REQUIREMENTS TASK FORCE,
Joint USDA-NASA Study, August 1973 - February 1978.
8USDA Application Test Experiment Plan, July 1977.
May 16, 1978