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Medium
- sound recordings[remove]41
- oral histories (literary works)19
- instructional materials15
- black-and-white photographs12
- photographs12
- timelines (chronologies)11
- transcripts11
- documentaries and factual works9
- texts (document genres)8
- articles6
- web sites4
- interviews3
- letters (correspondence)3
- reports3
- teaching guides3
- annotated bibliographies2
- biographies2
- correspondence2
- legislative records2
- maps2