http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
2 volumes : color illustrations ; 27 cm. + teacher's ed. (2 volumes in 4)
[1] Beginnings through Reconstruction -- [2] Reconstruction to the present.
Leonard C. Wood, Ralph H. Gabriel, Edward L. Biller.