TY  - BOOK
AU  - Heller, Robert L. 
TI  - Earth science
T2  - Challenges to Science
SN  - 0-07-028037-1
PY  - 1979///
CY  - New York
PB  - Webster Division, McGraw-Hill 
KW  - AstronomyEarth ScienceGeodynamics
ER  -