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-?.
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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).