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Medium
- documentaries and factual works18
- instructional materials18
- photographs16
- sound recordings15
- black-and-white photographs13
- texts (document genres)11
- web sites10
- financial records9
- timelines (chronologies)9
- transcripts9
- letters (correspondence)7
- slides (photographs)6
- study guides6
- articles5
- oral histories (literary works)4
- books3
- lesson plans3
- teaching guides3
- administrative records2
- advertisements2