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Medium
- black-and-white photographs[remove]6
- instructional materials[remove]6
- sound recordings5
- documentaries and factual works4
- articles3
- photographs3
- timelines (chronologies)3
- letters (correspondence)2
- transcripts2
- books1
- lesson plans1
- scrapbooks1
- slide shows1
- slideshows1
- texts (document genres)1
- web sites1