Geological Survey (U.S.)Chart of standard map symbols used on U.S. topographic maps.;Map on verso.;1 chart, illustrated;56 x 44 cm.JPEG2000https://digital.library.illinois.edu/items/9fa1a600-994e-0134-2096-0050569601ca-7gerU.S. Geological Survey (Washington, D.C.)PublicThe topographic maps of the United States [standard symbols].OtherWorld1882University of Illinois Urbana-Champaign