@online {353,
	title = {USGS Topoview},
	year = {2014},
	publisher = {United States Geological Survey},
	abstract = {<em>An MGS favorite: Contemporary to historic topographic maps.</em> TopoView highlights one of the USGS{\textquoteright}s most important and useful products, the topographic map. In 1879, the USGS began to map the Nation{\textquoteright}s topography. This mapping was done at different levels of detail, in order to support various land use and other purposes. As the years passed, the USGS produced new map versions of each area. The most current maps are available from The National Map. TopoView shows the many and varied older maps of each area, and so is useful for historical purposes{\textemdash}for example, the names of some natural and cultural features have changed over time, and the {\textquoteright}old{\textquoteright} names can be found on these historical topographic maps.
},
	keywords = {$\#$MapsDataPublications, $\#$Topo, topographic maps, USGS},
	url = {http://ngmdb.usgs.gov/maps/TopoView/}
}
