http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
xvi, 527 pages : illustrations, maps ; 24 m.
Revised edition of: Soil genesis and classification / S.W. Buol, F.D. Hole, R.J. McCracken. 3rd edition 1989.
Includes bibliographical references (pages 447-510) and index.