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There are two kinds of USGS maps. Two articles on directionsmap.com explain the situation: US Topo – A New National Map Series. Larry Moore, May 2011. US Topo - A New National Map Series, 2012 ...
Answer
There are two kinds of USGS maps. Two articles on directionsmap.com explain the situation: US Topo – A New National Map Series. Larry Moore, May 2011. US Topo - A New National Map Series, 2012 ...