TY  - BOOK
AU  - Mansfied,George Rogers
TI  - Phosphate Rock in 1922
T2  - Mineral Resources of the United States, 1923-Part II
U1  - 661 
PY  - 1923///
CY  - Washington, D.C.
PB  - Government Printing Office
KW  - MINERIA
KW  - FOSFATO
N1  - Impreso
ER  -