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Medium
- web sites[remove]33
- texts (document genres)18
- instructional materials15
- timelines (chronologies)12
- documentaries and factual works10
- black-and-white photographs9
- study guides9
- photographs7
- sound recordings5
- bibliographies3
- biographies (literary works)3
- interviews3
- articles2
- biographies2
- essays2
- maps2
- newspapers2
- oral histories (literary works)2
- pamphlets2
- reports2