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1. 中华人民共和国人口分布, 密度图

Image Princeton University Public content
1989. Hu, Huanyong, 1901- and 胡焕庸, 1901-. Relief shown by spot heights. July 1986. Title sheet 37 x 27 cm. Accompanying explanation dated 1988. Includes inset of South China Sea islands. [Beijing] : Zhongguo di tu chu ban she ; [Shanghai] : Xin hua shu dian Shanghai fa xing suo fa xing, 1989.

4. Aeromagnetic map of Minnesota, northwestern region, Plate 1

University of Minnesota Public content
1989. Chandler, Val W. Total magnetic intensity anomaly (relative to the earth's magnetic field), color coded, scale 1:250,000. Interpretation of magnetic data collected... Minnesota Geological Survey.

5. Aeromagnetic map of Minnesota, northwestern region, Plate 2

University of Minnesota Public content
1989. Chandler, Val W. Total magnetic intensity anomaly, contour, scale 1:250,000. Interpretation of magnetic data collected from airborne surveys, the map contours (line... Minnesota Geological Survey.

6. Aeromagnetic map of Minnesota, southwestern region, Plate 1

University of Minnesota Public content
1989. Chandler, Val W. Total magnetic intensity anomaly (relative to the earth's magnetic field), color coded, scale 1:250,000. Interpretation of magnetic data collected... Minnesota Geological Survey.

7. Aeromagnetic map of Minnesota, southwestern region, Plate 2

University of Minnesota Public content
1989. Chandler, Val W. Total magnetic intensity anomaly, contour, scale 1:250,000. Interpretation of magnetic data collected from airborne surveys, the map contours (line... Minnesota Geological Survey.

8. Albany, New York, 1989 (USGS 30 x 60 Minute Quadrangle DRG)

Raster Harvard University Public content
1989. Geological Survey (U.S.). This layer is a digital raster graphic of the 30 x 60 Minute USGS topographic map of the Albany, New York quadrangle, 1989, covering also portions ... United States Geological Survey.
1989. Aerospace Center (U.S.), United States. National Imagery and Mapping Agency., United States. Defense Mapping Agency., Harvard University. Center for Geographic Analysis., and East View Cartographic, Inc. This layer is a georeferenced raster image of the United States Aerospace Center's Tactical Pilotage Chart (TPC) 1:500,000 map series sheet entitle... Harvard Map Collection, Harvard College Library.
1989. Aerospace Center (U.S.), United States. National Imagery and Mapping Agency., United States. Defense Mapping Agency., Harvard University. Center for Geographic Analysis., and East View Cartographic, Inc. This layer is a georeferenced raster image of the United States Aerospace Center's Operational Navigation Chart (ONC) 1:1,000,000 map series sheet ... Harvard Map Collection, Harvard College Library.