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Medium
- instructional materials18
- sound recordings9
- timelines (chronologies)8
- black-and-white photographs7
- documentaries and factual works7
- articles6
- photographs6
- letters (correspondence)4
- maps4
- teaching guides4
- transcripts4
- interviews3
- legislative records3
- lesson plans3
- slide shows3
- oral histories (literary works)2
- reports2
- study guides2
- texts (document genres)2
- web sites2