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Medium
- instructional materials4
- teaching guides4
- articles3
- photographs3
- sound recordings3
- timelines (chronologies)3
- interviews2
- legislative records2
- letters (correspondence)2
- maps2
- oral histories (literary works)2
- annotated bibliographies1
- correspondence1
- learning modules1
- maps (documents)1
- newsletters1
- records1
- reports1
- resource units1
- slide shows1