Northern United States Isotherms Climate & Weather 1859 Isaac Stevens mapIsothermal Chart of the Region North of the 36th Parallel &c &c between the Atlantic & Pacific Oceans, Compiled under the Direction of Isaac I. Stevens. (Old Maps, 19th Century Maps, Americana, United States, Isotherms, Climate Maps, Weather Maps, Scientific Cartography). Issued c. 1859, New York by Sarony, Major & Knapp for U. S. Gov report. Beautiful 19th century antique map, with lithographed color. Fascinating assortment of mountains seen in the