TY  - BOOK
AU  - Hedberg,Holis D.
TI  - International stratigraphic guide
U1  - 551.7 
PY  - 1976///
CY  - New York
PB  - John Wiley and Sons
KW  - Historical geoloy
KW  - Stratigraphy
KW  -  Stratigraphic guide - International
ER  -