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Medium
- instructional materials33
- sound recordings33
- oral histories (literary works)22
- transcripts21
- black-and-white photographs18
- articles17
- photographs17
- teaching guides14
- timelines (chronologies)11
- web sites9
- documentaries and factual works8
- lesson plans8
- news7
- texts (document genres)7
- interviews6
- unedited footage6
- essays5
- letters (correspondence)5
- maps5
- moving images5