http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
1 online resource (190 unnumbered pages) : illustrations, maps.
by William R. Barton and Carl E. Goldsmith.
Includes bibliographical references (pages 120-122).
Barton, William R. (William Russell), 1925-
Report of investigations (United States. Bureau of Mines) ; 7070