TY  - BOOK
AU  - Coons,A.T.
TI  - The production of slate in 1913
T2  - Mineral Resources of the United States, calendar year 1913-Part II
U1  - 553 
PY  - 1914///
CY  - Washington, D.C.
PB  - Government Printing Office
KW  - MINERIA
KW  - PIZARRA
KW  - PRODUCCION DE PIZARRA
N1  - Impreso
ER  -