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Medium
- moving images11
- news11
- unedited footage11
- articles7
- instructional materials7
- teaching guides6
- interactive resource5
- transcripts5
- interviews4
- resource units4
- sound recordings3
- legislative records2
- letters (correspondence)2
- oral histories (literary works)2
- photographs2
- timelines (chronologies)2
- black-and-white photographs1
- encyclopedias1
- lesson plans1
- maps1