The online collection consists of 609 rare and historical books from the Library of the University of Warsaw's Institute of History. Selected rare books and early imprints can be viewed directly on the page or downloaded to a computer in PDF or JPG formats. The website also allows users to access materials that have not previously been made available due to their poor state of preservation. Tools for the presentation of manuscripts are available under a GNU General Public License.
The project was carried out by Clio: Friends of the University of Warsaw Institute of History Research Foundation and the Polish History Museum, with funding from the Ministry of Culture and National Heritage’s Digital Heritage program.