Image is part of research condcuted by Harold J. Wiens for the article: The Shu Tao or Road to Szechwan
Author(s): Herold J. Wiens
Source: Geographical Review, Vol. 39, No. 4 (Oct., 1949), pp. 584-604
Published by: American Geographical Society
Stable URL: http://www.jstor.org/stable/210674