00289nam a2200109 a 450000500170000002000150001708200170003210000230004924500480007226000400012030000190016020251203092005.0  a013710930X  a526,bD, cro  aCromley, Robert G.  aDigital cartography, Robert G. Cromley, eng  aNew Jersey, Prentice-Hall, USc1992  axi,317p.c22cm