TY  - BOOK
AU  - Ponnamperuma Cyril ed.
ED  - College Park Colloquium on Chemical Evolution (2nd : 1975 :University of Maryland)
ED  - 
TI  - Chemical Evolution of the Early precambrian: Colloquim
U1  - 551.71 
PY  - 1977///
CY  - New York
PB  - Academic press
KW  - Chemical evolution
KW  - Stratigraphy
ER  -