TY  - BOOK
TI  - Cycles of essential elements 
SN  - 0879331291
U1  - 574.52 POM  
PY  - 1974///.
CY  - Stroudsburg : 
PB  - Dowden, Hutchinson & Ross, Inc., 
KW  - Biogeochemical cycles
N1  - Includes index.
ER  -