TY  - BOOK
AU  - Dunbar, Carl O.
TI  - Principles of stratigraphy
U1  - 551.7 
PY  - 1957///
CY  - NewYork
PB  - John Wiley and sons
KW  - Geology -
KW  - Geology - Historical geology -
N1  - Includes bibliographical referencesand index
ER  -