Odoardo Beccari spent 2 1/2 years in Sarawak
http://www.pacsoa.org.au/wiki/Odoardo_Beccari_(1843_-_1920)
Huge collection of botanical type specimens in Florence's Museum of Natural History - http://parlatore.msn.unifi.it/types/search.php for Beccari, O and Malaysia ordered by Family asc..
-> 65 pages - 1300 types, some duplicated, many synonymised; omitted some not found to be valid, a few misclassified...

For palms - http://www.palmweb.org

Shells - Beccari and Doria - https://www.biodiversitylibrary.org/item/41741