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Medium
- instructional materials5
- teaching guides[remove]5
- articles3
- sound recordings3
- timelines (chronologies)3
- annotated bibliographies2
- black-and-white photographs2
- correspondence2
- learning modules2
- maps2
- photographs2
- encyclopedias1
- interviews1
- legislative records1
- lesson plans1
- letters (correspondence)1
- newsletters1
- oral histories (literary works)1
- records1
- reports1