http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Previously classed: NS 1.22:Sci 2/6/ ; NS 1.22:
Vols. for <1980-> some issues distributed to depository libraries in microfiche.
National Science Foundation, Washington, D.C. 20550