Title from title screen (viewed September 15, 2014).
Also available online in PDF format from the U.S. Geological Survey Warehouse (http://pubs.er.usgs.gov/).
"A detailed description of the size, attitude, mineralogy, chemical composition, and geologic setting of the thorium veins in the northeastern part of the Lemhi Pass district."
Bibliography
Includes bibliographical references (pages 84-86) and index.