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Medium
- instructional materials6
- timelines (chronologies)6
- sound recordings5
- black-and-white photographs4
- photographs4
- web sites4
- interviews3
- articles2
- lesson plans2
- oral histories (literary works)2
- texts (document genres)2
- transcripts2
- annotated bibliographies1
- biographies1
- broadsides1
- government records1
- learning modules1
- legislative records1
- letters (correspondence)1
- maps1