TY  - BOOK
AU  - Hedberg,Hollis Dow
ED  - International Union Of Geological Sciences. International Subcommission On Stratigraphic Classification
TI  - International stratigraphic guide: A guide to stratigraphic classification, terminology and procedure 
SN  - 0471367435
AV  - QE651 I57 1976
PY  - 1976///
CY  - New York
PB  - J. Wiley
KW  - Estratigrafía
ER  -