http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
[U.S. exploring expedition during years 1838-1842, under command of Charles Wilkes, U.S.N
Atlas to Vol. XII, Mollusca and shells, engraved illustrations]
Electronic reproduction. [Bethesda, Md.] : ProQuest, 2014. digital, PDF file. ProQuest U.S. Executive Branch Documents Mode of access: World Wide Web via ProQuest website.