U-series disequilibria in early diagenetic minerals from Lake Magadi sediments, Kenya: Dating potential

U-Th-Pb systematics in hydrothermally altered granites from the Granite Mountains, Wyoming

U-Th-Pb zircon dating of the 13.8-Ma dacite volcanic dome at Cerro Rico de Potosí, Bolivia

U-Xe, U-Kr, and U-Pb systematics for dating uranium minerals and investigations of the production of nucleogenic neon and argon

U.S. Geological Survey silicate rock standards

U.S. Geological Survey standards--II. First compilation of data for the new U.S.G.S. rocks

U.S. Oceans and Human Health Centers Funded

U.S. Quaternary Fault and Fold Database Released

U.S. to launch return Mars visit

UB stellar photometry around the association OB81 in M31: new OB associations

Über den Isotopengehalt des Kohlenstoffs in Süsswasser-Kalkablagerungen

Uber die Fluoreszenz organischer Spuren in anorganischen Stoffen und ihre Verbreitung in der Natur

Über die Hell-Dunkel-Struktur der urgashaltigen Chondrite Breitscheid und Pantar

UBgRIJKs photometry in the FORS Deep Field (Heidt+, 2003)

Ubiquitous brecciation after metamorphism in equilibrated ordinary chondrites

UBV colors of Virgo cluster irregular galaxies

UBV observations of bright galaxies

UBV photometry of the anticenter cluster Berkeley 21

UBVI CCD Photometry of Open Cluster NGC 2324

UBVI CCD Photometry of the Remote Old Open Cluster AM-2