international journals such as European Journal of Cardio-Thoracic Medicine, New England Journal of Medicine, and The Lancet. UJ archaeologists lead explorations of ancient sites in various parts of the world, including Egypt, Cyprus, Central America, South Asia and Altay. The astronomers take part in major international projects, including H.E.S.S. and VIPERS. The work of UJ bio-technologists has been published in journals, such as Bioorganic & Medicinal Chemistry, Molecular Ecology Resources, and European Journal of Human Genetics. In the English-speaking world, the Jagiellonian University has international partnerships with the University of Cambridge, University of Melbourne, University of Chicago, University of California, Los Angeles, London School of Economics, University of Rochester, University of California, Irvine, Case Western Reserve University. In the French-speaking world, partner universities include the Sorbonne, University of Montpellier. UJ also maintains strong academic partnership with Heidelberg University, Germany's oldest university. The Jagiellonian University offers specializations in German law, in conjunction with Heidelberg University and Johannes Gutenberg University of Mainz. Other cooperation agreements exist with Charles University Prague, University of Vienna, University of Tokyo, Saint Petersburg State University, Technical University of Munich, and Free University of Berlin. Libraries The university's main library, the Jagiellonian Library (Biblioteka Jagiellońska), is one of Poland's largest, with almost 6.5 million volumes; it is a constituent of the Polish National Libraries system. It is home to a world-renowned collection of medieval manuscripts, which includes Copernicus' De Revolutionibus, the Balthasar Behem Codex and the Berlinka. The library also has an extensive collection of underground political literature (so-called drugi obieg or samizdat) from Poland's period of Communist rule between 1945 and 1989. The beginning of the Jagiellonian Library is traditionally considered the same as that of the entire university – in 1364; however, instead of having one central library it had several smaller branches at buildings of various departments (the largest collection was in Collegium Maius, where works related to theology and liberal arts were kept). After 1775, during the reforms of Komisja Edukacji Narodowej, which established the first Ministry of Education in the world, various small libraries of the university were formally centralised into one public collection in Collegium Maius. During the partitions of Poland, the library continued to grow thanks to the support of such people as Karol Józef Teofil Estreicher and Karol Estreicher. Its collections were made public in 1812. Since 1932, it has been recognised as a legal deposit library, comparable to the