TY  - BOOK
AU  - Voskuil,Walter H.
TI  - A geography of minerals
T2  - The Brown foundations of geography series
U1  - 553 
PY  - 1969///
CY  - Dubuque
PB  - W. C. Brown Co.
KW  - Mines and mineral resources
N1  - Bibliography: p. 112-114
ER  -