Author： Obermeyer Nancy J.
Publisher： Cartography and Geographic Information Society
ISSN： 1545-0465
Source： Cartography and Geographic Information Science, Vol.34, Iss.2, 2007-04, pp. : 129-132
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
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