TY  - GEN
AU  - Hesser, Dale T.
AU  - Leach, Susan S.
TI  - Focus on earth science
SN  - 0675026717
U1  - 550   
PY  - 1989///
CY  - Columbus : Merrill Publishers
KW  - Earth science
N1  - Includes bibliographical references and index
ER  -