2004. Instituto Nacional de Estadística, Geografía e Informática (Mexico), Geological Survey (U.S.), and Canada Centre for Remote Sensing. This line shapefile represents roads in North America at 1:1,000,000 scale. The roads included in this layer are either those that connect major ce... Geological Survey (U.S.).
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1952. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1951. Topography by plane-table surveys 1952";Relief... Geological Survey (U.S.).
1955. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1952. Topography by plane-table surveys 1953.";Relie... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1925. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1903.";Relief shown by contours, spot heights and bathymetric soundings.;1 map, colored;45 x 70 cm.;1:62,500. Geological Survey (U.S.).
1950. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1939. Topography by plane-table methods 1948";Relief... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1960. Geological Survey (U.S.). Contour interval 20 feet.;"Topography from aerial photographs by photogrammetric methods and by planetable surveys. Aerial photographs taken 1957";... Geological Survey (U.S.), Geological Survey Division (Urbana, Ill.), and Kentucky Geological Survey (Lexington, Ky.).
1949. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1940. Topography by plane-table methods 1947";Relief... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
2005. Geological Survey (U.S.). This polygon shapefile portrays the state boundaries of the United States, and the boundaries of Puerto Rico and the U.S. Virgin Islands. The map l... Geological Survey (U.S.).
1949. Geological Survey (U.S.). (W 88⁰45ʹ00ʺ--W 88⁰30ʹ00ʺ/N 39⁰30ʹ00ʺ--N 39⁰15ʹ00ʺ);"Culture and drainage in part compiled from aerial photographs taken 1939. Topography by plane-... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1955. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1952. Topography by plane-table surveys 1952-1953.";... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).