http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Growth response to fertilizer in a young aspen-birch stand
Northeastern Forest Experiment Station, Upper Darby, Pa.
Miroslaw M. Czapowskyj, Lawrence O. Safford.
USDA Forest Service research note NE ; 274