http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Metalliferous deposits of the greater Helena mining region, Montana
1 online resource (xi, 318 pages, 47 pages of plates) : illustrations, maps (some color).
Title from title screen (viewed Oct. 16, 2015).
Includes bibliographical references and index.
Bulletin (Geological Survey (U.S.)) ; no. 842