http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Towards a taxonomic classification of humus forms
[by] R.N. Green, R.L. Trowbridge, K. Klinka.
"A publication of the Society of American Foresters."
"Supplement to Forest Science, volume 39, number 1"--Cover.