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Cline.     9971508230 Observational plasma astrophysics : five years of Yohkoh and beyond edited by Tetsuya Watanabe, Takeo Kosugi and Alphonse C. Sterling.     0792349857 Observational tests of cosmological inflation edited by T. Shanks ... [et al.].     079231431X Observational tests of the stellar evolution theory : symposium no. 105 held in Geneva, Switzerland, September 12-16, 1983 edited by Andrâe Maeder and Alvio Renzini.     9027717745 Observations and predictions of eclipse times by early astronomers by John M. Steele.     0792362985 Observations concerning the planet Venus Francesco Bianchini ; translated by Sally Beaumont ; assisted by Peter Fay.     3540199802 Observations in the 21-cm neutral hydrogen line. Observaciones en la línea de 21 cm del hidrógeno neutro. [By] E. Bajaja [and] F.R. Colomb.     0872796434 Observatories [John D. 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Skiff.     0521256658 Observing meteors, comets, supernovae, and other transient phenomena Neil Bone.     1852330171 Observing the Caldwell objects David Ratledge.     1852336285 Observing the constellations John Sanford.     067168924X Observing the moon : a practical guide for amateur astronomers Peter T. Wlasuk.     1852331933 Observing the moon : the modern astronomer's guide Gerald North.     0521622743 Observing the planets Peter T. Wlasuk.     1852333448 Observing the sky Carole Stott.     0816721327 Observing the sun Peter O. Taylor.     0521401100 Observing the universe edited by Nigel Henbest.     0855207272 Observing variable stars Gerry A. Good.     1852334983 Observing variable stars : a guide for the beginner David H. Levy.     0521627559 Observing variable stars : a guide for the beginner David H. Levy.     0521321131 Observing visual double stars Paul Couteau ; translated by Alan H. Batten.     0262030772 Ochava espera y astrofâisica : textos y estudios sobre las fuentes âArabes de la astronomâia de Alfonso X ediciâon preparada por Mercáe Comes, Honorino Mielgo y Julio Samsâo.     8440477953 Odisea 1874, o, El primer viaje internacional de cientâificos mexicanos Marco A. Moreno Corral.     9681624602 Of stars and men : human response to an expanding universe Harlow Shapley.     0313243026 Of stars and men : reminiscences of an astronomer Zdenéek Kopal.     0852745672 Of the plurality of worlds William Whewell ; edited and with new introductory material by Michael Ruse.     0226894355 On Aristotle's "On the heavens 1.1-4" Simplicius ; translated by R.J. Hankinson.     0801439078 On civilized stars : the search for intelligent life in outer space Joseph F. Baugher.     0136344119 On comets: a nineteenth-century hypothesis.     0901579017 On relativity theory editors, Y. Choquet-Bruhat, T.M. Karade.     9971978210 On some properties of the local galactic disk as determined by star clusters Andrzej Strobel. Interstellar extinction curve and related spectral features / Jacek Kre±owski.     8301074825 On Stonehenge Fred Hoyle.     0716703645 On Stonehenge [by] Fred Hoyle.     0435329588 On the "great circle reduction" in the data analysis for the astrometric satellite Hipparcos by H. van der Marel.     9061322359 On the cosmic horizon : ten great mysteries for third millennium astronomy Jeffrey Bennett.     0321029712 On the day you were born Debra Frasier.     0152579958 On the distances between sun, moon, and earth according to Ptolemy, Copernicus, and Reinhold by Janice Adrienne Henderson.     9004093788 On the glassy sea : an astronomer's journey Tom Gehrels.     0883185989 On the heavens I and II Aristotle ; edited and translated by Stuart Leggatt.     0856686638 On the moon Patrick Moore.     0304354694 On the origin of the solar system, by H. Alfvâen.     0837165954 On the path of Venus Lloyd Motz ; illustrated by Susan Detrich.     0394831063 On the principles of astronomy an edition of the Arabic and Hebrew versions with translation, analysis, and an Arabic-Hebrew-English glossary. By Bernard R. Goldstein.     0300013876 On the revolution of heavenly spheres Nicolaus Copernicus ; [translated by Charles Glenn Wallis].     1573920355 On the revolutions Nicholas Copernicus ; edited by Jerzy Dobrzycki ; translation and commentary by Edward Rosen.     0801820391 On the revolutions Nicholas Copernicus ; translation and commentary by Edward Rosen.     0801845157 On the revolutions of the heavenly spheres Copernicus ; a new translation from the Latin, with an introd. and notes by A. M. 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Kitchin.     075030345X Optical astronomy from the earth and moon : Astronomical Society of the Pacific, Summer Scientific Meeting, San Diego, California, 13-15 July 1993 edited by Diane M. Pyper and Ronald J. Angione.     0937707740 Optical detectors for astronomy : proceedings of and ECO CCD Workshop held in Garching, Germany, October 8-10, 1996 edited by James W. Beletic and Paola Amico.     0792349253 Optical detectors for astronomy II : state-of-the-art at the turn of the millennium edited by Paola Amico and James W. Beletic.     0792365364 Optical illusions : the life story of Bernhard Schmidt, the great stellar optician of the twentieth century by Erik Schmidt.     9985501020 Optical/IR telescope arrays : a study of their potential for satisfying observational requirements in astronomy for a large aperture system in the late 1990s and beyond C.M. Humphries ... 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