This interesting thematic map by Lorin Blodget appeared in an atlas covering Maryland and Washington, D.C. published by Stedman, Brown & Lyon. Red printed isolines indicate the mean temperatures for summer, winter, and the year. Rainfall figures are shown as well. The map includes town and city names, railroads, and rivers.
References: Rumsey #2239.002.
Condition: B+
On a slightly toned sheet with light scattered foxing and offsetting.