Polygon representation of the extents of the United States Geological Survey topographic maps.
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{'Title': 'Maryland USGS Topographic Grids', 'Author': '', 'Comments': 'Polygon representation of the extents of the United States Geological Survey topographic maps.', 'Subject': "Map service of the USGS 7.5' and 3.75' quadrangle grids for Maryland.", 'Category': '', 'AntialiasingMode': 'None', 'TextAntialiasingMode': 'Force', 'Keywords': 'MD,Maryland,Location,LOCA,Topographic,Topo,Quadrangle,Vector,MD iMAP,WFS,WMS,KML,Quad Grid,Quarter Quad Grid,Dynamic'}
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