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Medium
- instructional materials4
- slide shows4
- sound recordings3
- black-and-white photographs2
- documentaries and factual works2
- photographs2
- annotated bibliographies1
- articles1
- correspondence1
- interviews1
- learning modules1
- maps1
- newsletters1
- oral histories (literary works)1
- records1
- reports1
- teaching guides1
- timelines (chronologies)1