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Medium
- instructional materials4
- timelines (chronologies)4
- black-and-white photographs2
- photographs2
- biographies (literary works)1
- documentaries and factual works1
- lesson plans1
- maps1
- maps (documents)1
- online exhibitions1
- oral histories (literary works)1
- sound recordings1
- study guides1
- texts (document genres)1
- transcripts1
- web sites1