http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
prepared by U.S. Department of Transportation, Research and Special Programs Administration, Office of Pipeline Safety.
Some content currently available via Internet at the OPS web site. Address as of 7/25/02: http://ops.dot.gov/stats.htm.
Description based on: Calendar year 1991.
Some issues also available via Internet at the OPS web site. Address as of 7/25/02: http://ops.dot.gov/annual.htm; current access is available via PURL.
Microfiche. 1991- [Washington, D.C.] : Supt. of Docs., U.S. G.P.O., [1993- microfiches : negative.
United States. Materials Transportation Bureau.