Call me a dinosaur, but I like this sort of stuff. A proper printable catalogue of all the material in a collection, with photographs and all, in this case the 200+ olive varieties in Italy’s Centro di Ricerca per l’Olivicoltura e l’Industria Olearia. ((Don’t worry, there’s biochemical and molecular stuff on the second page of each variety entry.)) No doubt all the info is in the appropriate database, where it can be compared to the holdings of other institutes and all. But I’m still grateful for the PDF version.
Luigi: One of my favourites “The Vegetables of New York” from 1928 is available in any form you want from archive.org. Lovely paintings of varieties.