During my visit to Brussels, I devoted my time primarily to study the autographs present in the Dautzenberg archive. They are a mix of well-known and totally unknown persons, both malacologists and paleontologists. The letters and postcards are kept together in 8 bands, alphabetically arranged.
Since I only did A-G this time, I will need to return to do the rest. Some handwritings have been published in my recent paper, but there is a lot of interesting stuff for those who consider biohistory as a field that merits attention.