http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
National Geographic research and exploration
National Geographic research & exploration
4 volumes : color illustrations, maps ; 28 cm.
Bibliography and index of geology 0098-2784
Current bibliography on African affairs 0011-3255
Current contents : agriculture, biology, & environmental sciences 0090-0508