TY  - BOOK
AU  - York D
AU  -  Farquhar R M
TI  - Earth's age and geochronology
T2  - Pergamon international library of science, technology , engineering and social studies
U1  - H5:Ce, L2-;2 
PY  - 1972///
CY  - Oxford
PB  - Pergamon Press        
KW  -  Precambrain
KW  - Stratigraphy
N1  - Bibliography 167-76p
ER  -