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Medium
- instructional materials33
- teaching guides14
- sound recordings13
- timelines (chronologies)11
- black-and-white photographs10
- articles9
- lesson plans8
- photographs8
- documentaries and factual works7
- maps5
- resource units5
- texts (document genres)5
- web sites5
- interviews4
- letters (correspondence)4
- slide shows4
- transcripts4
- biographies3
- learning modules3
- annotated bibliographies2