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Medium
- instructional materials11
- timelines (chronologies)7
- photographs6
- black-and-white photographs5
- documentaries and factual works5
- sound recordings5
- transcripts4
- web sites4
- lesson plans3
- oral histories (literary works)3
- teaching guides3
- articles2
- letters (correspondence)2
- maps2
- scrapbooks2
- study guides2
- texts (document genres)2
- books1
- finding aids1
- interviews1