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Medium
- instructional materials4
- teaching guides4
- interviews3
- resource units3
- oral histories (literary works)2
- sound recordings2
- annotated bibliographies1
- articles1
- correspondence1
- learning modules1
- maps1
- newsletters1
- photographs1
- records1
- reports1
- slide shows1
- speeches1
- timelines (chronologies)1
- transcripts1
- video recordings (physical artifacts)1