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Medium
- instructional materials10
- sound recordings9
- photographs7
- timelines (chronologies)7
- documentaries and factual works5
- articles4
- black-and-white photographs4
- maps4
- web sites4
- reports3
- texts (document genres)3
- transcripts3
- legislative records2
- letters (correspondence)2
- oral histories (literary works)2
- records2
- slide shows2
- study guides2
- teaching guides2
- annotated bibliographies1