http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Status of pre-college science, mathematics, and social studies
educational practices in U.S. schools : an overview and summaries of three studies
National Science Foundation, Directorate for Science Education : for sale by the Supt. of Docs., U.S. Govt. Print. Off.
"Prepared for National Science Foundation, Directorate for Science Education, Office of Program Integration."