http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Progress of work in terrestrial magnetism of U.S. Coast and Geodetic Survey, Jan. 1, 1925 to June 30, 1927
Electronic reproduction. [Bethesda, Md.] : ProQuest, 2014. digital, PDF file. ProQuest U.S. Executive Branch Documents Mode of access: World Wide Web via ProQuest website.