TY  - BOOK
AU  - Loughlin,G.F.
AU  - Coons,A.T.
TI  - Stone in 1921
T2  - Mineral Resources of the United States, 1921-Part II
U1  - 622 
PY  - 1923///
CY  - Washington, D.C.
PB  - Government Printing Office
KW  - MINERIA
KW  - PIEDRA
N1  - Impreso
ER  -