Genre
- photographs100
- black-and-white photographs93
- drawings (visual works)60
- botanical illustrations52
- scientific illustrations (images)52
- correspondence48
- watercolors (paintings)48
- periodicals47
- serials (publications)44
- letters (correspondence)41
- oral histories (literary genre)35
- reminiscences35
- interviews34
- publications (documents)34
- sound recordings34
- architectural drawings (visual works)33
- newsletters30
- posters25
- manuscripts (documents)17
- field notes15
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