TY  - BOOK
AU  - Lyon,Edward E.
TI  - Earth science manual
SN  - 0697151263
AV  - GB55.B4 
PY  - 1992///
CY  - Lowa Wm
PB  - : Brown Publishers
KW  - Earth
KW  - Physical geography
KW  - Programmed instruction
N1  - Includes bibliographical refernces and index
ER  -