USGS National Coal Resource Assessment (NCRA) region boundaries, 1999
收藏U.S. Geological Survey1999-01-01 更新2026-04-23 收录
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https://www.sciencebase.gov/catalog/item/60ad1df4d34e4043c850e63e
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资源简介：
This dataset portrays the boundary of the Regions as defined for the National Coal Resource Assessment Project.
提供机构：
United States Geological Survey
创建时间：
1999-01-01
