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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