TY  - BOOK
AU  - Walker,James C.G.
TI  - Earth history: The several ages of the Earth 
SN  - 0-86720-022-7
PY  - 1986///
CY  - Boston, Portola Valley
PB  - Jones & Bartlett Publ.
KW  - Earth science
KW  - Human evolution
KW  - Paleontology
ER  -