http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
American national standard for tree care operations
tree, shrub, and other woody plant maintenance -- standard practices (fertilization)
Tree, shrub and other woody plant maintenance-- standard practices (fertilization)
Secretariat, National Arborist Association, Inc.; Approved September 24, 1998, American National Standards Institute, Inc.