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Medium
- photographs[remove]21
- timelines (chronologies)[remove]21
- instructional materials20
- sound recordings11
- oral histories (literary works)8
- online exhibitions7
- articles6
- transcripts6
- black-and-white photographs4
- documentaries and factual works4
- letters (correspondence)4
- lesson plans3
- maps3
- reports3
- teaching guides3
- web sites3
- digital maps2
- interviews2
- learning modules2
- legislative records2