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Medium
- instructional materials10
- teaching guides10
- interviews8
- resource units8
- transcripts8
- oral histories (literary works)4
- video recordings (physical artifacts)3
- articles1
- black-and-white photographs1
- correspondence1
- encyclopedias1
- fliers (printed matter)1
- learning modules1
- lesson plans1
- sound recordings1
- texts (document genres)1
- timelines (chronologies)1
- worksheets1