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- instructional materials[remove]10
- teaching guides7
- photographs6
- articles5
- sound recordings5
- timelines (chronologies)5
- black-and-white photographs4
- letters (correspondence)4
- web sites4
- maps (documents)3
- annotated bibliographies2
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- legislative records2
- lesson plans2
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- transcripts2
- correspondence1
- interviews1
- learning modules1