http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
NTIS subject classification (past and present)
N.T.I.S. subject classification (past and present)
National Technical Information Service, U.S. Department of Commerce.
"Supersedes NTIS/SR-77/02 and NTIS/SR-75/01"--Rept. doc. p.