TY  - BOOK
AU  - Spencer, Edgar W.
AU  - Spencer, Edgar W.
ED  - United Nation.
ED  - United Nation.
TI  - Earth Science : understanding environmental systems
SN  - 0-07-234146-7
U1  - 550 SPE 22
PY  - 2003///
CY  - New York.
PB  - Tata McGraw-Hill.
KW  - Earth science
ER  -