http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Crystalline rocks of the Potomac River Gorge near Washington, D.C
iii, 16 pages : illustrations, maps ; 29 cm. + 2 folded leaves in pocket.
"A description of the rocks exposed in the gorge of the Potomac River below Great Falls, with a discussion of their structural and metamorphic history."
Includes bibliographical references (page 16).
Shorter contributions to general geology
Geological Survey professional paper ; 414-H