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Medium
- instructional materials7
- sound recordings5
- articles3
- black-and-white photographs3
- documentaries and factual works3
- photographs3
- legislative records2
- letters (correspondence)2
- slide shows2
- teaching guides2
- timelines (chronologies)2
- interviews1
- lesson plans1
- maps1
- maps (documents)1
- online exhibitions1
- slideshows1
- transcripts1