Tourtelot, Harry Allison 1918-
Stratigraphic significance and petrology of phosphate nodules at base of Niobrara formation, east flank of black hills, South Dakota / by Harry A. Tourtelot and W. A. Cobban. -- Washington : United States Government Printing Office, 1968 - 22 p., [2] h. de lam. -- (Geological Survey Professional Paper ; 594-L).
Dakota del Sur
Estratigrafía
551.7(783)
Stratigraphic significance and petrology of phosphate nodules at base of Niobrara formation, east flank of black hills, South Dakota / by Harry A. Tourtelot and W. A. Cobban. -- Washington : United States Government Printing Office, 1968 - 22 p., [2] h. de lam. -- (Geological Survey Professional Paper ; 594-L).
Dakota del Sur
Estratigrafía
551.7(783)