1850. Thomas, Cowperthwait & Co. Washington prime meridian.   "Entered according to Act of Congress, in the year 1850, by Thomas, Cowperthwait & Co., in the clerks Office of the Di... Thomas, Cowperthwait & Co. (Philadelphia), 1850.
    
  
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      1850. Mitchell, S. Augustus (Samuel Augustus), 1792-1868 and Thomas, Cowperthwait & Co. Washington prime meridian. "Entered according to Act of Congress, in the year 1850, by Thomas, Cowperthwait & Co., in the clerks Office of the Dist...