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Medium
- sound recordings[remove]11
- instructional materials8
- black-and-white photographs6
- articles5
- photographs5
- timelines (chronologies)5
- documentaries and factual works3
- oral histories (literary works)3
- teaching guides3
- correspondence2
- legislative records2
- letters (correspondence)2
- maps2
- reports2
- slide shows2
- texts (document genres)2
- transcripts2
- annotated bibliographies1
- biographies1
- encyclopedias1