Ashland coalfield boundary; assessment area for the Knobloch coal resource unit (knbndg.shp)
收藏U.S. Geological Survey1999-01-01 更新2026-04-23 收录
下载链接：
https://www.sciencebase.gov/catalog/item/60ac09b5d34ea221ce51fdd5
下载链接
链接失效反馈官方服务：
资源简介：
This ArcView shapefile contains a polygon representation of the Ashland coalfield, Montana, as defined in the USGS National Coal Resource Assessment (NCRA) project. This theme was created specifically for the National Coal Resources Assessment in the Northern Rocky Mountains and Great Plains Region.
提供机构：
United States Geological Survey
创建时间：
1999-01-01
