Genre
- drawings (visual works)69
- botanical illustrations59
- scientific illustrations (images)56
- watercolors (paintings)50
- photographs42
- color photographs34
- color slides33
- slides (photographs)33
- pencil drawings12
- field notes10
- journals (accounts)10
- black-and-white photographs9
- pen and ink drawings9
- printed ephemera9
- sketchbooks9
- surveys (documents)9
- cross sections (orthographic projections)5
- posters2
- aerial photographs1
- albums (books)1
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