http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
1. [Shows: 7 1/2' published map available; 7 1/2' revised map available; limited revision in progress; photorevision in progress; outline of U.S. Census Bureau Metropolitan Statistical Area (MSA); priority requests for remapping] -- 2. [Shows: compilation dates of 7 1/2 minute quadrangles; photorevision dates of 7 1/2 minute quadrangles]