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)
E. Thomas Smiley, Sharon J. Lilly, and Patrick Kelsey.
"Companion publication to the ANSI A300 Standard for Tree, shrub, and Other Woody Plant Fertilization."
Includes bibliographical references (page 33).