TY  - BOOK
AU  - Hedberg, Hollis
TI  - International Stratigraphic Guide : A Guide to Stratigraphic Classification, Terminology and Precedure
SN  - 0471367435
PY  - 1976///
CY  - New York
PB  - John Wiley
KW  - Geology, Stratigraphic
ER  -