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Medium
- instructional materials36
- photographs[remove]36
- timelines (chronologies)20
- sound recordings13
- lesson plans11
- oral histories (literary works)11
- teaching guides11
- online exhibitions9
- texts (document genres)9
- articles8
- maps (documents)7
- web sites7
- black-and-white photographs6
- documentaries and factual works5
- letters (correspondence)5
- maps5
- transcripts5
- reports4
- correspondence3
- learning modules3