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Medium
- instructional materials6
- web sites6
- black-and-white photographs3
- lesson plans3
- photographs3
- teaching guides3
- texts (document genres)3
- articles2
- maps2
- oral histories (literary works)2
- timelines (chronologies)2
- annotated bibliographies1
- books1
- documentaries and factual works1
- editorial cartoons1
- legal documents1
- letters (correspondence)1
- minutes1
- moving images1
- online exhibitions1