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Medium
- documentaries and factual works10
- instructional materials9
- sound recordings9
- photographs7
- black-and-white photographs6
- texts (document genres)6
- timelines (chronologies)5
- transcripts5
- articles3
- letters (correspondence)3
- study guides3
- web sites3
- maps2
- oral histories (literary works)2
- administrative records1
- advertisements1
- annotated bibliographies1
- biographies1
- books1
- certificates1