http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Opinions of Martin Van Buren, vice president of the United States, upon the powers and duties of Congress, in reference to the abolition of slavery
either in the slave-holding states or in the District of Columbia : to which are added sundry documents showing his sentiments upon other subjects
Slavery in America and the world: history, culture & law