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Medium
- instructional materials5
- motion pictures (visual works)5
- sound recordings5
- timelines (chronologies)5
- black-and-white photographs4
- editorial cartoons4
- moving images4
- news4
- unedited footage4
- articles3
- legislative records3
- letters (correspondence)2
- photographs2
- teaching guides2
- biographies1
- biographies (literary works)1
- legislative acts1
- maps1
- maps (documents)1
- oral histories (literary works)1