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Medium
- articles3
- instructional materials[remove]3
- photographs3
- sound recordings3
- timelines (chronologies)3
- letters (correspondence)2
- maps2
- teaching guides2
- annotated bibliographies1
- black-and-white photographs1
- correspondence1
- documentaries and factual works1
- interviews1
- learning modules1
- legislative records1
- newsletters1
- oral histories (literary works)1
- records1
- reports1
- slide shows1