http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
and his journals of the Wilkes Expedition
x, 214 pages : illustrations, portraits, maps (on lining papers (1 folded)) ; 31 cm.
United States Exploring Expedition (1838-1842)
Memoirs of the American Philosophical Society ; v. 52