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Medium
- instructional materials25
- interviews[remove]25
- teaching guides21
- resource units19
- transcripts17
- oral histories (literary works)14
- video recordings (physical artifacts)6
- lesson plans4
- timelines (chronologies)4
- annotated bibliographies3
- black-and-white photographs3
- sound recordings3
- texts (document genres)3
- learning modules2
- photographs2
- web sites2
- articles1
- biographies1
- correspondence1
- documentaries and factual works1