TY  - BOOK
AU  - Cunningham Williams P.
AU  - Cunningham Mary A.
TI  - Principles of environmental science: inquiry and applications 
SN  - 0070647720
AV  - GE40.C8 2008 
PY  - 2008///
CY  - New York
PB  - McGraw-Hill publishing company limited
ER  -