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[1,"Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number",null,"https://ngmdb.usgs.gov/fgdc_gds/geolsymstd.php","FGDC-STD-013-2006"]
[4,"Brezinski, D.K., 2021, Geologic map of the Maryland Portion of the Emmitsburg and Taneytown Quadrangles, Frederick and Carroll Counties, Maryland",null,null,"DS01"]
[5,"American Geological Institute, 2012, Glossary of Geology",null,null,"DS02"]