http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Palynological analyses of upper Pennsylvanian coal beds and adjacent strata from the proposed Pennsylvanian system stratotype in West Virginia
a report on the stratigraphic distribution and abundance of upper Pennsylvanian palynomorphs
1 online resource (iv, 24 pages) : illustrations.
Includes bibliographical references (page 21).
U.S. Geological Survey professional paper ; 1486