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Medium
- transcripts[remove]72
- sound recordings60
- oral histories (literary works)47
- interviews22
- instructional materials10
- photographs7
- documentaries and factual works6
- resource units6
- teaching guides6
- black-and-white photographs5
- timelines (chronologies)4
- articles3
- correspondence2
- letters (correspondence)2
- memorandums2
- texts (document genres)2
- video recordings (physical artifacts)2
- administrative reports1
- agendas (administrative records)1
- bills (legislative records)1