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Medium
- instructional materials16
- teaching guides8
- timelines (chronologies)8
- sound recordings7
- articles6
- maps5
- photographs4
- resource units4
- texts (document genres)4
- black-and-white photographs3
- learning modules3
- lesson plans3
- web sites3
- biographies2
- correspondence2
- documentaries and factual works2
- interviews2
- legislative records2
- letters (correspondence)2
- oral histories (literary works)2