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Medium
- instructional materials8
- sound recordings[remove]8
- black-and-white photographs4
- teaching guides4
- articles3
- documentaries and factual works3
- photographs3
- legislative records2
- letters (correspondence)2
- resource units2
- slide shows2
- speeches2
- timelines (chronologies)2
- annotated bibliographies1
- maps1
- maps (documents)1
- oral histories (literary works)1
- slideshows1