http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Classification of soils and sedimentary rocks
proceedings of a symposium held at the University of Guelph, Guelph, Ontario, March 12 and 13, 1970
Symposium on Classification of Soils and Sedimentary Rocks, University of Guelph, 1970.
Sponsored by the Dept. of Land Resource Science, University of Guelph.