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http://memory.loc.gov
http://memory.loc.gov/ammem/index.html
http://memory.loc.gov/cgi-bin/ampage?collId=llsl&fileName=001/llsl001.db&recNum=253
http://memory.loc.gov/mss/mcc/028/0001.jpg
http://memory.loc.gov/rbc/rbcmisc/ody/ody0214/0214001v.jpg
http://babel.hathitrust.org/cgi/pt?u=1&num=476&seq=492&view=image&size=100&id=nyp.33433081900627
http://www.archives.gov/research/arc/index.html
http://americanhistory.si.edu/collections/surveying/type.cfm?typeid=18
http://americanhistory.si.edu/collections/surveying/object.cfm?recordnumber=758993
http://americanhistory.si.edu/index.cfm