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- instructional materials[remove]6
- photographs[remove]6
- articles4
- sound recordings4
- maps3
- timelines (chronologies)3
- black-and-white photographs2
- documentaries and factual works2
- letters (correspondence)2
- slide shows2
- teaching guides2
- annotated bibliographies1
- correspondence1
- interviews1
- learning modules1
- legislative records1
- lesson plans1
- newsletters1
- oral histories (literary works)1
- records1