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Medium
- instructional materials43
- teaching guides16
- documentaries and factual works11
- web sites11
- black-and-white photographs10
- texts (document genres)10
- timelines (chronologies)10
- lesson plans9
- photographs9
- sound recordings9
- articles7
- interviews6
- study guides6
- oral histories (literary works)5
- resource units5
- transcripts5
- correspondence4
- maps4
- biographies3
- editorial cartoons3