http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Stereographic method of determining whether planes of weakness transect pillars
3 unnumbered pages, 17 pages : diagrams ; 27 cm.
Includes bibliographical references (page 17).
Report of investigations - Bureau of Mines ; 8232