TY  - BOOK
AU  - Hee,Olman
ED  - United States.
TI  - A statistical analysis of United States demand for phosphate rock, potash and nitrogen
U1  -  552.1021 
PY  - 1969///
CY  - Washington, D. C.
PB  - United States Government Printing Office
KW  - Rocks
KW  - Classification
KW  - Statistics
KW  - Petrology
KW  - Rocks, Igneous
ER  -