U.S. GEOLOGICAL SURVEY DIGITAL DATA SERIES DDS-27

               Monthly Average Polar Sea-Ice Concentration

                         By Peter N. Schweitzer


                             POINTS OF CONTACT


    The principal technical contact is the author of all programs and
    documentation contained in this disc.  Questions regarding the
    operation of these programs, the contents of the CD-ROM, and the
    relevant source code should be directed to the technical contact:

        Peter N. Schweitzer
        MS 955, National Center
        U.S. Geological Survey
        Reston, VA 22092

        Tel: (703) 648-6533
        FAX: (703) 648-6647
        email: pschweitzer@usgs.gov

    Questions pertaining to the processing of the original SMMR and SSM/I
    data from which the NSIDC ice-concentration CD-ROM's were made should
    be directed to the technical contacts for the original data:

        National Snow and Ice Data Center
        CIRES, Box 449
        University of Colorado
        Boulder, CO 80309-0049

        Tel: (303) 492-1834 or (303) 492-5171
        FAX: (303) 492-2468
        email: nsidc@kryos.colorado.edu

    Questions pertaining to the original ETOPO5 data should be directed to
    the NGDC technical support staff:

        Global Ecosystems Database Project
        National Geophysical Data Center
        325 Broadway E/GC1
        Boulder, CO 80303

        Tel: (303) 497-6125
        FAX: (303) 497-6513
        email: info@mail.ngdc.noaa.gov


   Additional copies of this CD-ROM (Digital Data Series DDS-27) are sold by:

        U.S. Geological Survey, Information Services
        Box 25286, Denver Federal Center
        Denver, CO 80225-0286

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