All Smithsonian museums and Smithsonian Libraries locations continue to be closed to support the effort to contain the spread of COVID-19. We are not announcing a re-opening date at this time and will provide updates on a regular and as-needed basis.
![Cover of Su[m]ma de arithmetica geometria proportioni [et] proportionalita](https://library.si.edu/sites/default/files/styles/slick_300/public/books/covers/summadearithmeti00paci_cover.jpg?itok=4VowIpxD "Cover of Su[m]ma de arithmetica geometria proportioni [et] proportionalita")
