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REFERENCES Mapping Science Committee (1990~. Spatial Data Needs: The Future of tile National Mapping Program, Board on Earth Sciences and Resources, National Academy Press, Washington, D.C., 78 pp. Committee on Earth Sciences (1990~. Our Changing Planet: The F Y 1991 US. Global Change Research Program, Office of Science and Technology Policy, Washington, D.C., 60 pp. W. J. Craig (1989~. URISA research agenda, URISA Journal 1~1), 7-16. Committee on Data Management and Computation (1982~. Data Manage- ment and Computation. Volu'-ne 1: Issues and Reco~n~nendations, Space Science Board, National Academy Press, Washington, D.C., 167 pp. s Committee on Geophysical Data (1991~. A US. Strategyfor Global Change Data and Information Management, Board on Earth Sciences and Resources, National Academy Press, Washington, D.C., in review. 43