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Untersuchungen uber Mikroskopische Schaume und das Protoplasma Untersuchungen von mathematisch-astronomischen Darstellungen auf mittelalterlichen Astrolabien islamischer und europaischer Herkunft Untersuchungen zur Geschichte der Sternkunde Untersuchungen zur Geschichte der Tibetischen Kalenderrechnung Untersuchungen zur Sternnomenklatur der Araber Untitled : 49 entries Untitled (?) Untitled {?} [untitled] Unweaving the Rainbow Unweibung zur gehorigen Berichtigung der Uhren…… Up, up and away we go! Help Oxford's Balloon Appeal Take off. "Upon Mr. Maudslay's Patent Self-acting Stern Propeller" Urania's Mirror or a View of the Heavens Uraniborg och Stjarneborg Uraniscope Magnum, or the nature construction and use of the Grand Uraniscope. Being a new construction of an equatorial telescope, which by clock-work, and a planetary pendulum, becomes an automaton, and renders all the heavenly bodies stationary to the 'Uranium Isotope Separation in the U.K. during World War II' Uranographia Britannica Uranographie Chinoise ... Uranologion sive systema variorum authorum, qui de sphaera, ac sideribus, eorumque motibus Graece commentatisunt. Sunt autem horum libri. Gemini [&] Achillis Tatii "Isagoge ad Arati Phaenomena". Hipparchi libri tres, ad Aratum. Ptolemaei "de apparentiis."
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