TY  - BOOK
AU  - Spencer, Edgar Winston.
TI  - Earth science: understanding environmental systems 
SN  - 0072341467
AV  - QE28 .S7 2003
U1  - 550 21
PY  - 2003///
CY  - Boston
PB  - McGraw-Hill
KW  - Earth sciences
N1  - Includes index
UR  - http://www.loc.gov/catdir/description/mh024/2002025073.html
UR  - http://www.loc.gov/catdir/toc/mh023/2002025073.html
ER  -