Compiled under the direction of Isaac I. Stevens, Govnr. of Washington Territory. Stevens, Isaac Ingalls, 1818-1862. CREATED/PUBLISHED New York,  NOTES Scale 1:7,450,000. From 36th Congress, 1st session House. Ex. doc. no. 56. SUMMARY Indicates 'practicable railroad lines,' and 'proposed railroad lines.' Summer isotherms are in red, winter isotherms are in blue.