Total size of the collection: about 4500 titles across multiple locations from which the most important are: the University Library, the Science Park Library and the reference library of the Anton Pannekoek Institute for Astronomy. The collection astronomy is at the level of a collection for teaching and research. Astronomy is classified under Dutch Basic Classification Code 39.** and QB for Library of Congress. Several hundred publications of observatories are available of consultation by appointment.
Primary collection goals (research level) are: