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Medium
- instructional materials10
- teaching guides5
- sound recordings4
- timelines (chronologies)4
- articles3
- letters (correspondence)3
- oral histories (literary works)3
- annotated bibliographies2
- black-and-white photographs2
- interviews2
- legislative records2
- photographs2
- resource units2
- study guides2
- transcripts2
- documentaries and factual works1
- legislative acts1
- maps1
- maps (documents)1
- memorandums1