http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
a guide to improving elementary science education in your school district
National Science Resources Center (U.S.)
xiii, 225 pages : illustrations ; 23 cm.
National Science Resources Center, National Academy of Sciences, Smithsonian Institution.
Includes bibliographical references (pages 193-195) and index.