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. 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. 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. Thomas, Cowperthwait & Co. Relief shown by hachures.; Prime meridian: Greenwich.; Includes index to Turkish provinces.; Inset: Environs of Jerusalem.; At top of map: "67." 37... Thomas, Cowperthwait & Co (Philadelphia), 1850.