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Medium
- instructional materials14
- timelines (chronologies)14
- sound recordings9
- black-and-white photographs7
- articles6
- photographs5
- documentaries and factual works4
- letters (correspondence)4
- maps4
- teaching guides4
- texts (document genres)4
- web sites4
- legislative records3
- biographies (literary works)2
- learning modules2
- reports2
- study guides2
- transcripts2
- annotated bibliographies1
- biographies1