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Medium
- instructional materials165
- documents59
- timelines (chronologies)37
- teaching guides35
- sound recordings26
- photographs25
- black-and-white photographs23
- resource units23
- oral histories (literary works)22
- transcripts21
- interviews20
- texts (document genres)19
- documentaries and factual works17
- lesson plans16
- web sites15
- articles13
- online exhibitions13
- study guides11
- annotated bibliographies8
- fliers (printed matter)8