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Medium
- sound recordings[remove]18
- timelines (chronologies)18
- instructional materials17
- photographs11
- black-and-white photographs7
- articles6
- documentaries and factual works5
- transcripts5
- letters (correspondence)4
- web sites4
- legislative records3
- oral histories (literary works)3
- reports3
- teaching guides3
- texts (document genres)3
- biographies2
- digital maps2
- interviews2
- maps2
- moving images2