TY  - BOOK
AU  - Tourtelot,Harry Allison
AU  - Cobban,William Aubrey
TI  - Stratigraphic significance and petrology of phosphate nodules at base of Niobrara Formation, east flank of Black Hills, South Dakota
U1  - 551.8975243 
PY  - 1968///
CY  - Washington, D.C.
PB  - United States Government Printing Office
KW  - Geology, Stratigraphic
KW  - Cretaceous
KW  - Phosphates
KW  - Black Hill
KW  - South Dakota
KW  - Geology
KW  - Black Hills
KW  - Niobrara Formation
N1  - Bibliography: p. 18-20
ER  -