http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
approach to yellow-poplar tree valuation
Includes bibliographical references (page 13).
Upper Darby, Pa. : Northeastern Forest Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1969
USDA Forest Service research paper NE ; 137