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Medium
- photographs[remove]13
- sound recordings[remove]13
- instructional materials12
- timelines (chronologies)10
- articles5
- documentaries and factual works4
- letters (correspondence)4
- online exhibitions4
- transcripts4
- oral histories (literary works)3
- teaching guides3
- black-and-white photographs2
- digital maps2
- legislative records2
- maps2
- moving images2
- reports2
- tours (journeys)2
- annotated bibliographies1
- correspondence1