http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Rutile in Precambrian sillimanite-quartz gneiss and related rocks, east-central Front Range, Colorado
v, 17 pages : illustrations, maps ; 29 cm.
Geologic and geochemical study of rutile-bearing rocks in Colorado and description of their occurrence elsewhere.
by Sherman P. Marsh and Douglas M. Sheridan.
Geological Survey professional paper ; 959-G
Geology and resources of titanium in the United States