Onyx marble and travertine

Author:	Bowles, Oliver.
Year:	1940
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:6751R
Series:	Information circular / United States. Bureau of Mines ;
Report Number:	6751R
Subjects:	Onyx marble
	Travertine
	Marble industry and trade
Link:	https://hdl.handle.net/2027/mdp.39015077572157