TY  - BOOK
AU  - Gradstein,F.M.
TI  - The Geologic time scale 2012
SN  - 9780444594259 (set)
U1  - 551.701 
PY  - 2012///
CY  - Amsterdam, Boston
PB  - Elsevier
KW  - Geological time
N1  - One chart in pocket; Includes bibliographical references and index
ER  -