TY  - BOOK
AU  - Gradstein F M
AU  -  Agtererg F P
TI  - Quantitative stratigraphy
U1  - H5:(B28), M5 
PY  - 1985///
CY  - Dordrecht
PB  - D Reidel Pub.       
KW  -  Stratigraphy
KW  - Geology
ER  -