U Geminorum: A prolonged maximum

U Geminorum: a Test Case for Orbital Parameters Determination

U Geminorum: a test case for orbital parameters determination

U Geminorum: Máximo reciente

U isotope variations in CAIs: Implications for the age of the Solar System

U Isotopic Composition in Meteoritic Phosphate

U Lacertae-A Distant Variable Star with an Unusual Spectrum

U Moyen D'essais Economique et D'acces Aise EN Microgravite: la Caravelle Zero-G

u Nr. 618. Elemente der Iris

u Nr. 618. Observations on Lassell's Satellite of Neptune made at Cambridge U.S. Observatory

u Nr. 618. Opposition der Juno 1847, beobachtet am Dorpater Meridiankreise von Herrn Hofrath Dr. Clausen

u Nr. 618. Schreiben des Herrn Schaub an den Herausgeber

u Nr. 618. Vermischte Nachrichten

U Ophiuchi: an Eclipsing Binary with Rapid Apsidal Motion

U Orion. (Slovenian Title: U Oriona)

U Orionis

U Orionis - The evolution and proper motion of the OH maser envelope

U Orionis, observed by

U Pb ages and source composition by Hf-isotope and trace-element analysis of detrital zircons in Permian sandstone and modern sand from southwestern Australia and a review of the paleogeographical and denudational history of the Yilgarn Craton

U Pb ages and source composition by Hf-isotope and trace-element analysis of detrital zircons in Permian sandstone and modern sand from southwestern Australia and a review of the paleogeographical and denudational history of the Yilgarn Craton