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Medium
- instructional materials6
- learning modules6
- lesson plans4
- photographs3
- teaching guides3
- timelines (chronologies)3
- interviews2
- texts (document genres)2
- web sites2
- annotated bibliographies1
- articles1
- black-and-white photographs1
- correspondence1
- editorial cartoons1
- maps1
- maps (documents)1
- newsletters1
- oral histories (literary works)1
- records1
- reports1