U.S. astronomy and astrophysics : managing an integrated program Committee on the Organization and Management of Research in Astronomy and Astrophysics, National Research Council.     0309076269 U.S. National report to International Union of Geodesy and Geophysics, 1987-1990 [Margaret Ann Shea, editor-in chief].     0875907873 U.S. observatories : a directory and travel guide H. T. Kirby-Smith.     0442244517 Ultracool dwarfs : new spectral types L and T Hugh R.A. Jones, Iain A. Steele, eds.     3540423532 Ultraviolet-optical space astronomy beyond HST : proceedings of a meeting held at the Regal Harvest House Hotel, Boulder, Colorado, USA, 5-7 August 1998 edited by Jon A. Morse, J. Michael Shull, and Anne L. Kinney.     1886733856 Un itinâeraire insolite Vladimir Kourganoff.     9052018049 Under Capricorn : a history of southern hemisphere astronomy David S. Evans.     085274384X Under Newton's shadow : astronomical practices in the seventeenth century Lesley Murdin.     0852744560 Under the Southern Cross : a brief history of astronomy in Australia Ragbir Bhathal and Graeme White.     0864173768 Under the sun written and illustrated by Ellen Kandoian.     0399220259 Under the sun written and illustrated by Ellen Kandoian.     0396090591 Underground physics 87 : proceedings of the Second International Symposium, Baksan Valley, USSR, August 17-19, 1987 [editorial board G.V. Domogatsky ... et al.].     5020072141 Understanding cosmology from the editors of Scientific American ; compiled and with introductions by Sandy Fritz ; foreword by Donald Goldsmith.     0446678732 Understanding the heavens : thirty centuries of astronomical ideas from ancient thinking to modern cosmology Jean-Claude Pecker ; edited by Susan Kaufman.     3540631984 Understanding the universe Phillip Flower.     0314578803 Understanding the universe Phillip Flower. --     0314040919 Understanding the universe Raman K. Prinja, Richard Ignace.     081605228X Understanding the universe : an introduction to physics and astrophysics James B. Seaborn.     0387982957 Understanding the universe : the impact of space astronomy edited by Richard M. West.     9027716471 Une histoire de l'astronomie Jean-Pierre Verdet.     2020115573 Une histoire de la mâeridienne : textes, enjeux, dâebats et passions autour du mâeridien de Paris, 1666-1827 Jean-Pierre Martin ; prâeface de Suzanne Dâebarbat.     2905385944 Unfolding our universe Iain Nicolson ; original illustrations by Mark McLellan.     0521592704 Universal gene : the unifying factor Frederick Crooks.     0952936801 Universal ice : science and ideology in the Nazi state Robert Bowen.     1852931906 Universal natural history and theory of the heavens Immanuel Kant ; translated with introduction and notes by Stanley L. Jaki.     0707302943 Universe Andrew Haslam ; written by David Glover ; photography Jon Barnes.     1568473486 Universe Don Dixon.     0395312906 Universe Roger A. Freedman, William J. Kaufmann, III.     0716746476 Universe William J. Kaufmann III, Roger A. Freedman.     0716728265 Universe William J. Kaufmann III, Roger A. Freedman. --     0716734958 Universe William J. Kaufmann III, Roger A. Freedman. --     0716738236 Universe William J. Kaufmann III.     0716719274 Universe William J. Kaufmann, III.     0716716739 Universe William J. Kaufmann, III.     0716723794 Universe William J. Kaufmann, III.     0716720949 Universe : a computer-generated voyage through time and space Nigel Henbest ; photography, Philip Chudy.     0025509217 Universe : an evolutionary approach to astronomy Eric Chaisson.     0139383913 Universe : origins and evolution Theodore P. Snow, Kenneth R. Brownsberger.     0314098380 Universe alternatives : emerging concepts of size, age, structure, and behavior Billy L. Farmer.     0964998335 Universe down to Earth Neil De Grasse Tyson.     023107560X Universe guide to stars and planets Ian Ridpath ; illustrated by Wil Tirion.     0876633661 Universe in the classroom : a resource guide for teaching astronomy and instructor's manual for Universe by William J. Kaufmann, III Andrew Fraknoi.     0716716925 Universe. Stars and galaxies Roger A. Freedman, William J. Kaufmann, III.     0716746468 Universe. The solar system Roger A. Freedman, William J. Kaufmann, III.     071674645X University astronomy Jay M. Pasachoff, Marc L. Kutner.     0721670997 Unsolved problems in astrophysics John N. Bahcall and Jeremiah P. Ostriker, editors.     0691016070 Unsolved problems in stellar evolution : proceedings of the Space Telescope Science Institute Symposium held in Baltimore, Maryland, May 4-7, 1998 edited by Mario Livio.     0521780918 Unsolved problems of the Milky Way : proceedings of the 169th Symposium of the International Astronomical Union, held in The Hague, The Netherlands, August 23-29, 1994 edited by Leo Blitz and Peter Teuben.     0792340396 Untersuchungen von mathematisch-astronomischen Darstellungen auf mittelalterlichen Astrolabien islamischer und europèaischer Herkunft Burkhard Stautz.     3928186299 Until the sun dies by Robert Jastrow.     0446973483 Until the sun dies Robert Jastrow.     0393064158 Unusual telescopes Peter L. Manly.     0521382009 Unveiling the edge of time : black holes, white holes, wormholes John Gribbin.     0517881705 Unveiling the edge of time : black holes, white holes, wormholes John Gribbin.     051758591X Unveiling the universe : an introduction to astronomy J.E. van Zyl.     3540760237 Upper main sequence stars with anomalous abundances : proceedings of the 90th Colloquium of the International Astronomical Union, held in Crimea, U.S.S.R., May 13-19, 1985 edited by C.R. Cowley, M.M. Dworetsky, and C. Mâegessier.     902772296X Uppsala general catalogue of galaxies : data for 12,921 galaxies north of [Greek small letter delta] =-2p0s30§ by Peter Nilson.     9155400647 Uranometria Joannes Bayer.     0852970219 Uranometria 2000.0 Wil Tirion, Barry Rappaport, George Lovi.     094339614X Uranometria 2000.0 Wil Tirion, Barry Rappaport, George Lovi.     0993396158 Uranometria 2000.0 : deep sky atlas.     0943396719 Uranus by Dana Meachen Rau.     0756502993 Uranus by Dennis B. Fradin.     0516011774 Uranus by Gregory L. Vogt ; consultant Ralph Winrich.     0736805176 Uranus by Isaac Asimov ; with revisions and updating by Richard Hantula.     0836832434 Uranus by Larry Dane Brimner.     0516211560 Uranus by Linda George.     0737710039 Uranus by Margaret J. Goldstein.     082254654X Uranus by Rebecca Stefoff.     0761414010 Uranus by Susan Ring.     1590360974 Uranus Donna Walsh Shepherd.     0531201678 Uranus Gregory L. Vogt.     1562943308 Uranus Jay T. Bergstralh, Ellis D. Miner, Mildred Shapley Matthews, editors ; with 84 collaborating authors.     0816512086 Uranus Luke Thompson.     0823956490 Uranus Melissa Stewart.     0531120163 Uranus Seymour Simon.     0688065821 Uranus Seymour Simon. --     068806583X Uranus written by Steve Potts.     1583400990 Uranus : the planet, rings, and satellites Ellis D. Miner.     0139468803 Uranus : the planet, rings, and satellites Ellis D. Miner.     047197398X Uranus : the planets, rings, and satellites Ellis D. Miner.     0745804330 Uranus : the seventh planet Franklyn M. Branley ; illustrations by Yvonne Buchanan.     0690046855 Uranus : the seventh planet Michael D. Cole.     0766019527 Uranus and Neptune Ron Miller.     0761323570 Uranus and Neptune : the distant giants Eric Burgess.     0231064926 Uranus and the outer planets : proceedings of the IAU/RAS Colloquium no. 60 edited by Garry Hunt.     0521245737 Uranus, Neptune & Pluto Giles Sparrow.     1575723972 Uranus, Neptune, and Pluto Robin Kerrod.     082253908X Uranus, Neptune, and Pluto Tim Goss.     1588109186 Uranus, the sideways planet by Isaac Asimov.     1555323499 Uranus, the sideways planet by Isaac Asimov.     1555323243 Urbain Le Verrier, savant universel, gloire nationale, personnalitâe contentine Franðcoise Lamotte, Maurice Lantier, prâecâedâe de La Manche, terre d'astronomes / par Paul Levert.     2713400201 Urban astronomy Denis Berthier ; translated by Klaus Brasch.     052153190X Using the Meade ETX : 100 objects you can really see with the mighty ETX Mike Weasner ; with contributions by P. Clay Sherrod and Richard (Dick) Seymour.     1852333510 Using the telescope : a handbook for astronomers J. Hedley Robinson.     0470265140 Using the telescope : a handbook for astronomers J. Hedley Robinson.     071537592X UV and x-ray spectroscopy of astrophysical and laboratory plasmas : proceedings from the tenth international colloquium held at Berkeley, California, 3-5 February 1992 edited by Eric H. Silver and Steven M. Kahn.     052143470X UVB instrumentation and applications Ann R. Webb.     9056991213