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Medium
- instructional materials27
- sound recordings[remove]27
- timelines (chronologies)17
- black-and-white photographs13
- photographs13
- articles8
- documentaries and factual works8
- teaching guides6
- letters (correspondence)4
- online exhibitions4
- oral histories (literary works)4
- texts (document genres)4
- transcripts4
- annotated bibliographies3
- interviews3
- legislative records3
- reports3
- slide shows3
- web sites3
- biographies2