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Preface. 1: Current Advances in Astrometry. 1.1. Developments in Ground-Based Astrometric Techniques and Large Catalogues. 1.2. Space Missions. 1.3. Extragalactic Reference Frame. 2: Current and Future Needs for Very Accurate Astrometry. 2.1. Stellar Astrophysics. 2.2. Galactic Populations, Kinematics and Dynamics. 2.3. Extragalactic Astrometry. 2.4. Reference Frames and Solar System. 3: Expected Developments in High Precision Astrometry. 4: Conclusions. Index. Author Index.

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