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Medium
- photographs[remove]14
- timelines (chronologies)[remove]14
- instructional materials13
- sound recordings7
- oral histories (literary works)5
- articles4
- online exhibitions4
- transcripts4
- black-and-white photographs3
- maps3
- reports3
- web sites3
- documentaries and factual works2
- interviews2
- learning modules2
- lesson plans2
- letters (correspondence)2
- teaching guides2
- annotated bibliographies1
- correspondence1