http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
volumes (loose-leaf) : illustrations ; 30 cm.
v. 1. For grades K-3 / written by Maura O'Conner -- v. 2. For grades 4, 5 & 6 / written by Maura O'Conner, Kathy McGlauflin.
On cover: Living lightly in the city : an urban environmental education curriculum.