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Medium
- instructional materials16
- sound recordings8
- teaching guides8
- resource units6
- black-and-white photographs5
- articles4
- documentaries and factual works3
- interviews3
- oral histories (literary works)3
- photographs3
- transcripts3
- annotated bibliographies2
- legislative records2
- lesson plans2
- letters (correspondence)2
- slide shows2
- speeches2
- timelines (chronologies)2
- biographies1
- documents1