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Medium
- instructional materials6
- sound recordings[remove]6
- teaching guides6
- articles4
- photographs3
- timelines (chronologies)3
- correspondence2
- legislative records2
- letters (correspondence)2
- maps2
- resource units2
- speeches2
- annotated bibliographies1
- black-and-white photographs1
- encyclopedias1
- interviews1
- learning modules1
- maps (documents)1
- newsletters1
- oral histories (literary works)1