by C.W. Thornthwaite in cooperation with Division of Climate and Crop Weather, United States Weather Bureau; assistance in the preparation of the maps was furnished by the personnel of Works Projects Administration official project no. 65-2-42-282.
Thornthwaite, C. W. (Charles Warren), 1899-1963
Washington, Govt. Print. Off., 1941.
Book, Government publication
— Maps Collection Atlases (Lower Level)