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Medium
- sound recordings[remove]86
- transcripts17
- oral histories (literary works)15
- black-and-white photographs10
- instructional materials9
- documentaries and factual works8
- photographs8
- articles6
- timelines (chronologies)6
- texts (document genres)5
- letters (correspondence)3
- slide shows3
- web sites3
- correspondence2
- interviews2
- moving images2
- reports2
- teaching guides2
- annotated bibliographies1
- biographies1