http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Bird exclosures for branches and whole trees
Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Canada/United States Spruce Budworms Program
prepared by United States Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station ; Robert W. Campbell [and others].
"Canusa, Canada/United States Spruce Budworms Program."