1.1 xml http://explain.z3950.org/dtd/2.0/ texashistory.unt.edu 80 USGS Topographic Map Collection SRU Server for Collection USGS Topographic Map Collection, hosted by University of North Texas Libraries The USGS took over responsibility for mapping the country in 1879 and has been the primary civilian mapping agency of the United States ever since. This collection features the best known USGS maps which are the 1:24,000-scale topographic maps, also known as 7.5-minute quadrangles for the state of Texas. title title creator creator subject subject description description publisher publisher contributor contributor date date format format identifier identifier source source language language relation relation coverage coverage rights rights Dublin Core 10 dc 200 false