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Medium
- instructional materials[remove]17
- black-and-white photographs10
- photographs9
- timelines (chronologies)9
- sound recordings7
- texts (document genres)6
- articles5
- documentaries and factual works4
- lesson plans4
- web sites4
- interviews3
- online exhibitions3
- oral histories (literary works)3
- annotated bibliographies2
- biographies2
- fliers (printed matter)2
- legislative records2
- letters (correspondence)2
- maps2
- slide shows2