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Medium
- instructional materials3
- learning modules3
- timelines (chronologies)3
- interviews2
- lesson plans2
- photographs2
- teaching guides2
- annotated bibliographies1
- articles1
- black-and-white photographs1
- correspondence1
- maps1
- newsletters1
- oral histories (literary works)1
- records1
- reports1
- slide shows1
- sound recordings1
- texts (document genres)1
- web sites1