http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
effect of four herbicides on the survival and growth of nine hardwood species
North Central Forest Experiment Station (Saint Paul, Minn.)
Robert D. Williams and John E. Krajicek.
USDA Forest Service research note NC ; 206
North Central Forest Experiment Station, St. Paul.