Genre
- periodicals137
- newsletters117
- serials (publications)111
- photographs106
- black-and-white photographs95
- drawings (visual works)93
- botanical illustrations85
- scientific illustrations (images)84
- publications (documents)66
- pamphlets51
- watercolors (paintings)49
- architectural drawings (visual works)32
- line drawings (drawings)32
- oral histories (literary genre)29
- reminiscences29
- sound recordings29
- correspondence24
- letters (correspondence)20
- posters15
- interviews14
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