Bookstrom, A. A., Raines, G. L., and Johnson, B. R., 1995, Digital mineral
resource maps of phosphate and natural aggregate for the Pacific Northwest:  
a contribution to  the Interior Columbia Basin Ecosystem Management Project: 
U.S. Geological Survey Open-File Report 95-681, 28 p. plus 4 plates.  

This report describes the contents of a digital dataset (approximately 50 MB) 
which consists of ARC/INFO Export format files and associated macro programs.  
The dataset includes mineral resource maps of phosphate and of sand and gravel 
in the northwestern U.S. north of 39 degrees N latitude and west of approximately
108 degrees W longitude compiled from digital datasets for the states of
California, Idaho, Montana, Nevada, Oregon, Utah, Washington, and Wyoming.  The
report describes the distribution, quantity, and quality of these resources in 
the Pacific Northwest.  It also describes and discusses the uses, production, 
and likely future development of these resources, and the implications of 
resource development for ecosystem management in the interior Columbia River
Basin.   

The dataset also includes macro programs and complete plot files for creating
paper copies of the maps at a scale of 1:2,000,000.  Page-sized, color versions 
of the maps are included in this report as well as a description of how to obtain
the dataset over the Internet. 

Requirements:  A networked computer system is required to copy the dataset 
from the host computer across the Internet.  A Geographic Information System 
capable of importing ARC/INFO Export format files is required for access to the 
digital files.  All plot files are stored in HPGL2 format.  The digital dataset 
files are in UNIX ASCII format.