The Bibliographical Card-Catalogue of the I.A.P. Library

This bibliographical service is available at the Library of the “institut d’Astrophysique de Paris”. It is a hand-operated system, consisting of a card-catalogue concerning all astronomical objects (except those of the solar system). It was started in 1962 and has been updated regularly ever since. It has now more than 200.000 citations for about 19.000 entries arranged in wide sections and, inside each section, in alphabetic order. The main sections are: stars, novae and supernovae, radio-sources, X and γ sources, star clusters, clusters of galaxies, clouds, infrared objects. New sections are added when necessary. Any object is taken, even if it is not clear where to classify it (for example, supernova remnants can be found under supernovae or under X-ray sources).