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U.S. Army Corps of Engineers, Fort Worth District; Contract No. DACW63-90-D-0008, Delivery Order 13 [No sponsoring agency report number given]

U.S. Geological Survey Bulletin 1915

Über paarhufer der fluviomarinen schichten des Fajum, odontographisches und osteologisches Material

UC Publications in Geological Sciences, University of California Press

Ueber das Bayreuther versteinerte Holz

United States Exploring Expedition During the Years 1838, 1839, 1840, 1842, 1842 Under the Command of Charles Wilkes, U.S.N. Atlas: Geology

United States Geological Survey Professional Paper

University of California Publications in Geological Sciences

University of Kentucky Publication

Upper Paleozoic of Northeast Asia

Upper Triassic Stratigraphy and Palaeontology, New Mexico Museum of Natural History and Science Bulletin

Upper Triassic Stratigraphy and Paleontology, New Mexico Museum of Natural History and Science Bulletin

Upper Triassic Stratigraphy and Paleontology, New Mexico Museum of Natural History and Science Bulletin 21

Upper Triassic Stratigraphy and Paleontology. New Mexico Museum of Natural History and Science Bulletin

Uppermost Clinton (Middle Silurian) stratigraphy and petrology, east-central New York

Urumaco and Venzuelan Paleontology: The Fossil Record of the Northern Neotropics

Ustredniho Ustavu Geologickeho Czechoslovakia

Utah Geological Association Publication 28 (third edition)

UU Department of Earth Sciences