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1. Counties: Russian River Watershed, California, 1990

1990. Circuit Rider Productions. This polygon dataset contains county boundaries and features (usually shorelines). The county outlines were digitized from 1:100,000 scale mylar US... Circuit Rider Productions.

2. Provincial Boundaries: China, 1990

1990. China. Guo jia tong ji ju, Beijing Hua tong ren shi chang xin xi you xian ze ren gong si, Zhonghua di tu xue she, and University of Michigan. China Data Center. This polygon dataset represents provincial boundaries in China from 1990. These data were primarily based on the "The Administrative Maps of the Pe... University of Michigan. China Data Center.