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Medium
- web sites[remove]52
- instructional materials26
- texts (document genres)26
- photographs13
- timelines (chronologies)13
- black-and-white photographs11
- documentaries and factual works10
- lesson plans9
- study guides9
- maps (documents)8
- teaching guides8
- sound recordings5
- articles4
- bibliographies3
- biographies (literary works)3
- essays3
- interviews3
- biographies2
- learning modules2
- maps2