00942cam a22002651 4500 gs 59000185 DLC 20260227111408.0 760811s1958 nmubc b s000 0 eng c gs 59000185 (OCoLC)2364837 U.S. Geol. Survey Libr. WMUW DLC premarc QE796 .G4 564.80978967 Gehrig, John Leonard. Middle Pennsylvanian brachiopods from the Mud Springs Mountains and Derry Hills, New Mexico. Socorro, State Bureau of Mines and Mineral Resources, New Mexico Institute of Mining and Technology, 1958. 24 p. 6 plates, maps. 28 cm. New Mexico. Bureau of Mines and Mineral Resources. Memoir 3 Bibliography: p.22. Brachiopoda, Fossil. Paleontology Pennsylvanian. Paleontology New Mexico Sierra County. 29352 29352