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Medium
- instructional materials3
- teaching guides[remove]3
- annotated bibliographies2
- articles2
- maps2
- photographs2
- sound recordings2
- timelines (chronologies)2
- black-and-white photographs1
- correspondence1
- interviews1
- learning modules1
- legislative records1
- letters (correspondence)1
- newsletters1
- oral histories (literary works)1
- records1
- reports1
- slide shows1
- web sites1