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Medium
- web sites13
- instructional materials8
- black-and-white photographs4
- lesson plans4
- photographs4
- timelines (chronologies)4
- sound recordings3
- teaching guides3
- texts (document genres)3
- articles2
- maps2
- oral histories (literary works)2
- transcripts2
- annotated bibliographies1
- biographies (literary works)1
- books1
- documentaries and factual works1
- editorial cartoons1
- interviews1
- legal documents1