http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Monthly, with separate annual cumulation
Feb. 1975-Dec. 1975 issues were numbered N30-N40.
Merged with: Landsat U.S. standard catalog, ISSN 0364-7560, to form: Landsat 2 world standard catalog and Landsat 3 world standard catalog.
Earth Resources Technology Satellite: Non-U.S. standard catalog