TY  - BOOK
AU  - Hesser, Dale T.
AU  - Leach, Susan S.
TI  - focus on earth science
SN  - 0675026717
AV  - QE 28 .H47 1989 
PY  - 1989///
CY  - Columbus
PB  - Merril Publishing company
KW  - Earth science
N1  - Include index
ER  -