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Medium
- instructional materials16
- timelines (chronologies)10
- sound recordings8
- articles7
- teaching guides6
- black-and-white photographs5
- photographs5
- documentaries and factual works4
- letters (correspondence)4
- maps4
- lesson plans3
- texts (document genres)3
- biographies2
- correspondence2
- interviews2
- learning modules2
- legislative records2
- oral histories (literary works)2
- study guides2
- transcripts2