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2. Libre Map Project - Wikipedia

   en.wikipedia.org/wiki/Libre_Map_Project

   The Libre Map Project was started by Jared Benedict and around 100 additional individuals contributing money to purchase (or "liberate") a full set of 1:24K scale USGS topographic maps in Digital raster graphic form. [1] The map files were then hosted by archive.org to ensure the map data will continue to be freely available to everyone ...

3. GeoPDF - Wikipedia

   en.wikipedia.org/wiki/GeoPDF

   GeoPDF products are used to deliver maps and imagery from multiple US government agencies. Quadrangles of The National Map are available from the USGS store in as GeoPDF products and are free to download. The US Army Corps of Engineers distributes GeoPDF maps through the U.S. Army Corps of Engineers Topographic Engineering Center.

4. Quadrangle (geography) - Wikipedia

   en.wikipedia.org/wiki/Quadrangle_(geography)

   A "quadrangle" is a topographic map produced by the United States Geological Survey (USGS) covering the United States. The maps are usually named after local physiographic features. The shorthand "quad" is also used, especially with the name of the map; for example, "the Ranger Creek, Texas quad". A quadrangle is defined by north and south ...

5. List of free geology software - Wikipedia

   en.wikipedia.org/wiki/List_of_free_geology_software

   MS Windows: Java: Free to use software to digitize geological cross-sections, and display and edit borehole logs Geoscience ANALYST [30] Free 3D visualization and communication software for integrated, multi-disciplinary geoscience and mining data and models, which also connects to Python through geoh5py, its open-source API Mira Geoscience Ltd.

6. United States Geological Survey - Wikipedia

   en.wikipedia.org/wiki/United_States_Geological...

   Today's U.S. Topo quadrangle (1:24,000) maps are mass-produced, using automated and semiautomated processes, with cartographic content supplied from the National GIS Database. [33] In the two years from June 2009 to May 2011, the USGS produced nearly 40,000 maps, more than 80 maps per work day. [33]

7. Ord Mountains (south of Apple Valley, California) - Wikipedia

   en.wikipedia.org/wiki/Ord_Mountains_(south_of...

   The mountains are labelled on the south end of the Apple Valley South USGS quadrangle map, and the north end of the Lake Arrowhead quadrangle. The high point is 4951 feet, at 34°23′24.6″N 117°11′34.2″E  /  34.390167°N 117.192833°E  / 34.390167; 117.192833

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9. United States Geological Survey Library - Wikipedia

   en.wikipedia.org/wiki/United_States_Geological...

   The United States Geological Survey Library (USGS Library) is a program within the United States Geological Survey (USGS), a scientific bureau within the Department of Interior of the United States government. The USGS operates as a fact-finding research organization with no regulatory responsibility.