http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Montana, North Dakota, South Dakota, Saskatchewan, Manitoba : 1978 Williston Basin Symposium, Billings, Montana, September 24-27, 1978
Montana Geological Society 24th annual conference
Williston Basin Symposium (1978 : Billings, Mont.)
ix, 447 pages : illustrations, maps ; 29 cm. & portfolio (16 leaves of plates : illustrations ; 27 cm.)