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Medium
- instructional materials33
- teaching guides18
- resource units11
- transcripts11
- oral histories (literary works)9
- documents8
- interviews8
- photographs8
- black-and-white photographs7
- sound recordings6
- documentaries and factual works5
- articles4
- correspondence3
- slide shows3
- writings3
- legislative acts2
- letters (correspondence)2
- newspaper clippings2
- speeches2
- timelines (chronologies)2