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Medium
- texts (document genres)[remove]56
- instructional materials19
- web sites18
- documentaries and factual works15
- black-and-white photographs12
- timelines (chronologies)12
- letters (correspondence)11
- photographs10
- sound recordings10
- study guides10
- transcripts5
- biographies (literary works)4
- lesson plans4
- maps4
- articles3
- bibliographies3
- biographies3
- interviews3
- visual works3
- advertisements2