In May 2018 the Museo Galileo library received as a donation a section of the personal library of Pietro Stefanelli (1835-1919), wellknown florentine professor of entomology, founding member of the Italian Entomological Society and active collaborator of the Istituto Sperimentale per la Zoologia Agraria of Florence.
The section, which integrates and enriches the sections donated in 2009 and 2015, is made up of approximately 200 monographs published from the second half of the nineteenth century through the first half of the twentieth and mostly related to physics, chemistry and natural sciences. In addition, there are some ancient books and many periodicals' issues.