http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
6 volumes : illustrations (some color) ; 25-28 cm.
[1] Teacher's annotated edition -- [2] Teacher's resource book -- [3] Workbook -- [4] Workbook, teacher's edition -- [5] Unit tests, blackline masters.