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The Army Map Service Special Foreign Activities are carried out by the 64th Engineer Battalion (Base Topographic). Its assigned mission was to provide AMS with required geodetic, mapping control and field classification data which are used in the production of various scale topographic maps.
United Nations Cartographic Section has many free maps in PDF format, at least some with the layers intact. However most UN maps are under UN copyright, so check before uploading. See here for their policy, this page about requesting permission. USGS Maps. Every USGS topographic map available for free download from the Internet Archive.
USGS Topographic maps are downloadable as pdf files from a searchable map or by a search if the map name is known. How a Topographic Map is Manufactured, History, and Other Information; The International Cartographic Association (ICA) Commission on Topographic Mapping
The Engineer Topographic Battalion's wartime mission was the development of accurate 4-color topographic maps created through timely survey work, drafting, printing, and distribution of military maps as required by the Allied Armed Forces of the United States. The Battalion was first formed in December 1943 and deactivated in December 1946.
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.
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 ...
The maps use the Hellenic Geodetic Reference System 1987 (HGRS87 or ΕΓΣΑ'87) which specifies a Transverse Mercatorial Projection mapping Greece in one zone. 1:25.000 scale - 26 maps available for regions near Athens; 1:50.000 scale - approximately 385 maps; 1:100.000 scale - around 130 maps available; 1:250.000 scale - 32 maps available
The maps are subject to ongoing revision, and about 60 maps are issued in new release each year. From 2012, a civilian series printed on plastic sheets on both sides and in a larger format were produced. Each map sheet is now equivalent to four different maps in the military series. The civilian series include 212 different maps.