http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Ten steps for recording pictographs and petroglyphs
1 online resource ( xiii, 129 pages) : illustrations (some color.
Lawrence L. Loendorf and Nancy Medaris Stone.
Includes bibliographical references (pages 115-124) and index.