Isothermal Chart United States Atlantic Pacific Oceans c. 1856 old antique mapIsothermal Chart of the Region North of the 36th Parallel &c; &c; Between the Atlantic and Pacific Oceans. Compiled under Isaac Stevens, Gov. of Washington Territory. (North America, United States, Canada, Midwest, New England, Pacific Northwest, Isothermal Map). Issued c. 1856, Washington D. C. by the U. S. Government. Lithographed by Sarony, Major, and Knapp. Lovely antique lithographed map overprinted in colors. Interesting mountain ranges shown