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Medium
- instructional materials43
- teaching guides27
- oral histories (literary works)20
- resource units20
- interviews18
- transcripts15
- timelines (chronologies)14
- photographs13
- sound recordings11
- online exhibitions7
- lesson plans6
- video recordings (physical artifacts)5
- articles4
- black-and-white photographs4
- fliers (printed matter)4
- annotated bibliographies3
- biographies3
- reports3
- texts (document genres)3
- biographies (literary works)2