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. Thomas, Cowperthwait & Co. (W 97°00ʹ--W 89°07ʹ/N 44°30ʹ--N 39°46ʹ). Page number in lower right corner: 35. Differs from other edition (OCLC 78771984): includes Do. propos... Thomas, Cowperthwait & Co. (Philadelphia).
1850. Young, J. H. (James Hamilton). Relief shown by hachures.; Prime meridians: Greenwich and Washington.; Insets: Gold region of California. -- District of Columbia. 38 x 64 centimet... Thomas, Cowperthwait (Philadelphia, Pa).
1850. Shows rail roads, canals, capitals, important towns.; Includes 1 inset: Nova Scotia, New Brunswick &c. Scale approximately 1:4,435,000.; "Entered a... Thomas. Cowperthwait & Co (Philadelphia [Pa).
1850. Thomas, Cowperthwait & Co. Covers the southern third of Manhattan and a small part of Brooklyn. "References" on two edges of map. "11."--Upper right margin. From: A new un... (Philadelphia)S. Augustus Mitchell.
1850. Walling, Henry Francis, 1825-1888. Relief shown by hachures.; Shows towns, roads, railroads, cemeteries, marshes, etc.; Titles from place name printed on county map.; Extends from th... H.F. Walling (Cambridge, Mass).
1850. Wyld, James, 1812-1887. Relief shown by hachures.; Title on slipcase: Central America, Isthmus of Tehuantepec, Panama and Nicaragua.; Transferred from the collection of th... J. Wyld (London).
1850. East India Company. Army. Bombay Army. Relief shown by hachures.; Includes references. 153 x 130 centimeters, folded to 26 x 23 centimeters Scale approximately 1:511,000 General Map Coll... Quarter Master General's Office (Bombay).
1850. Thomas, Cowperthwait & Co. Relief shown by hachures and spot heights. Shows counties, the Apache and Comanche Indian areas, the Cross Timbers, roads, and land "explored by L... Thomas, Cowperthwait & Co. (Philadelphia), 185-?.
1850. Abert, J. W. (James William), 1820-1897. Relief shown by hachures. 63 x 50 Centimeters Scale approximately 1:636,000 General Map Collection. War Dept (Washington, D.C).