Thanks to the advice of my colleague Astrid Balsem, curator at Allard Pierson in Amsterdam, I was able to visit the CRAI Biblioteca de Reserva in Barcelona during the last week of May 2019. I stayed there in the context of an Erasmus+ exchange with Bart Jaski, curator at the University Library of Utrecht. Neus Verger, Gemma Caballer and Marina Ruiz showed us the rich collections (more than 120,000 editions printed between 1501 and 1820, 1240 incunables and 2150 manuscripts!), explained several...