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Medium
- instructional materials12
- timelines (chronologies)8
- black-and-white photographs7
- articles6
- sound recordings6
- photographs5
- texts (document genres)5
- documentaries and factual works4
- letters (correspondence)4
- maps4
- teaching guides4
- biographies3
- online exhibitions3
- oral histories (literary works)3
- reports3
- study guides3
- web sites3
- correspondence2
- interviews2
- learning modules2