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Medium
- instructional materials15
- black-and-white photographs12
- sound recordings11
- photographs10
- timelines (chronologies)8
- articles6
- documentaries and factual works6
- oral histories (literary works)6
- web sites6
- teaching guides5
- texts (document genres)5
- maps4
- biographies3
- slide shows3
- annotated bibliographies2
- born digital2
- correspondence2
- interviews2
- learning modules2
- legislative records2