Labels:text | screenshot | number | electronic device | e-book readers | font OCR: 1999 Resource Assessment of Selected Tertiary Coal Beds and Zones in the Northern Rocky Mountains and Great Plains Region The U.S. Geological Survey has assessed resources of selected coal Disc 1 and the PDF and TIFF files on Disc 2 : of the Tertiary Fort Union Formation and equivalent units in the Northern Rocky Mountains and Great Plains region. The assessment focused on Macintosh computer with 68020 (Macintosh II series) or greater those selected coal beds and zones in the Powder River, Williston, processor. MacOS 7.0 or later, 24 megabytes (MB) RAM, and 20 Hanna-Carbon, and Greater Green River Basins most likely to be utilized MB hard-disk space. in the next few decades. In other basins Tertiary coal resources are Sun SPARCstation, SunOS 4.1.3 or later, or Solaris 2.3, or later, summar ...