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71. Heat Flow, San Marino, 1981

1981. International Heat Flow Commission, International Association of Seismology and Physics of the Earth's Interior, and Oklahoma State University. Department of Geography. Cartography Service. This point shapefile contains heat flow data for SanMarino compiled from sources in 1981. Heat flow is a measure of heat loss across the surface of... International Heat Flow Commission.

72. State Boundaries of India, 1981

1981. ML InfoMap (Firm). This layer is a polygon theme representing state boundaries of India for 1981 and includes socio-demographic Census attribute data such as total po... ML InfoMap (Firm).

73. United States Geographic Names Information System Hospitals, 1974-2014

1981. United States Geological Survey and Environmental Systems Research Institute (Redlands, Calif.). This point shapefile contains the proper names and locations of hospitals in the United States and its Territories using the Federal standard for g... Environmental Systems Research Institute (Redlands, Calif.).

74. United States Geographic Names Information System Summits, 1974-2014

1981. Environmental Systems Research Institute (Redlands, Calif.) and Geological Survey (U.S.). This point shapefile contains the proper names and locations of mountain summits and peaks in the United States and its Territories using the Feder... Environmental Systems Research Institute (Redlands, Calif.).