You can find some amazing things in online archives. Below are some pages from a sketchbook by a botanist named Roland Thaxter, who lived from 1858-1932 (read more about him here).
The actual sketchbook is in a library at Harvard, but it is shared via The Biodiversity Heritage Library, which “works collaboratively to make biodiversity literature openly available to the world as part of a global biodiversity community.”
Source: Roland Thaxter sketch book, – Biodiversity Heritage Library