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Medium
- instructional materials13
- sound recordings[remove]13
- timelines (chronologies)[remove]13
- photographs10
- articles6
- black-and-white photographs4
- documentaries and factual works4
- letters (correspondence)4
- transcripts4
- oral histories (literary works)3
- teaching guides3
- digital maps2
- legislative records2
- maps2
- moving images2
- online exhibitions2
- reports2
- scrapbooks2
- texts (document genres)2
- tours (journeys)2