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Medium
- sound recordings[remove]53
- oral histories (literary works)25
- instructional materials15
- photographs14
- transcripts14
- black-and-white photographs13
- timelines (chronologies)11
- documentaries and factual works10
- texts (document genres)8
- articles6
- interviews5
- letters (correspondence)4
- moving images4
- web sites4
- reports3
- teaching guides3
- annotated bibliographies2
- biographies2
- correspondence2
- legislative records2