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Medium
- instructional materials15
- teaching guides[remove]15
- lesson plans5
- sound recordings5
- articles4
- photographs4
- resource units4
- timelines (chronologies)4
- web sites4
- black-and-white photographs3
- interviews3
- maps (documents)3
- texts (document genres)3
- annotated bibliographies2
- correspondence2
- learning modules2
- legislative records2
- letters (correspondence)2
- maps2
- oral histories (literary works)2