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"St. Louis (Missouri) Directories: 1854-1855 Wuger, Konrad, mathematical instrument maker 112 S. 2nd. 1857-60 Wuger, Konrad, mathematical instrument maker 63 n. 2nd r. same. 1861-63 no directories. 1864-65 not listed." Reference: Smart, Charles E. The Makers Of Surveying Instruments In America Since 1700 Troy, New York: Regal Art Press. 1962
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