REMOTE DOWNLOAD NOT AVAILABLE - please contact data@library.columbia.edu for access. Tianjin Main Rivers (China 2000 Census) is a polygon theme representing major rivers in Tianjin in 2000. It also includes some lake, dam, and reservoir features. This data layer is part of the China 2000 Township Census data set produced by the All China Marketing Research Co. and distributed by the University of Michigan, China Data Center.