Below are links to institutions with which the NBA has special relations or which otherwise are deemed of particular relevance for the majority of researchers using the NBA. Clicking on one of the addresses below one is supplied with a brief description of the site and a direct connection to the site itself. The list carries no pretension of being in any way complete. Suggestions of other relevant links will be welcome. Niels Bohr Institute American Institute of Physics Center for History of Physics This is a unique site and institution for people interested in the history of modern physics. With regard to archival research, the International Catalog of History of Physics and Allied Sciences contains descriptions of collections of scientists’ papers not only in the United States but around the world. The Emilio Segrè Visual Archives constitutes a large photograph collection for the field. There are also various exhibits, and the Center’s Newsletter, which can also be read on the site, contains much interesting information. Archive for History of Quantum Physics (AHQP) A project sponsored by the American Philosophical Society and the American Physical Society Department of Science Studies at Aarhus University This is by far the largest university department of its kind in Denmark, devoted in particular to the history of the physical sciences and the history of technology. In addition to information on faculty and education, the site includes notices about its archival collections pertaining to the history of science and technology as well as its photograph collection. Royal Swedish Academy Center for History of Science This center, which has recently moved to improved premises, is a substantial resource for the history in particular of Swedish science. The site provides information on its rich archival collections in this regard. Theseus This is an experimental information center located at the University of Copenhagen devoted to the history mathematics. It contains data in particular with regard to personal papers of deceased Danish mathematicians, but also encourages interaction with its users toward the end of sharing information of interest for the history of mathematics. Top Niels Bohr Archive, nba@nbi.dk