Marvelllous
They have everything related to historical printing industry. A nice and refined collection. They also organized exhibitions of illustration, prints, posters and books. I visited a Neruda exhibit and they were showing books illustrated by Picasso, Mattise and Chagall, among other artists, very famous and well-known. Admission is free because collection was donated to the people of Puerto Rico by Adler, the main collector. After that they continued collecting. I recommend this place a lot.