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Medium
- instructional materials6
- motion pictures (visual works)5
- moving images5
- sound recordings5
- timelines (chronologies)5
- black-and-white photographs4
- editorial cartoons4
- news4
- unedited footage4
- articles3
- legislative records3
- reports3
- letters (correspondence)2
- oral histories (literary works)2
- photographs2
- records2
- teaching guides2
- biographies1
- biographies (literary works)1
- interviews1