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- California. Metropolitan Transportation Commission7
- Stackhouse, Cecil4
- United States. Bureau of Transportation Statistics4
- Beijing Hua tong ren shi chang xin xi you xian ze ren gong si3
- China. Guo jia tong ji ju3
- University of Michigan. China Data Center3
- Zhonghua di tu xue she3
- Circuit Rider Productions2
- All China Marketing Research Co., Ltd.1
- California. Department of Fish and Game. Marine Resources Region1
- Cao, Changyong1
- Earle, Carville1
- Geological Survey (U.S.)1
- Heppen, John1
- Louisiana State University (Baton Rouge, La.). Department of Geography and Anthropology.1
- Otterstrom, Samuel1
- U.S. Department of Commerce, Bureau of the Census, Geography Division1