Sand and gravel dredging methods and costs of J.K. Davison & Bro., Pittsburgh, Pa.

Author:	Williamson, George H.
Year:	1932
Document Type:	USBI
Issuing Agency:	U.S. Dept. of Commerce, Bureau of Mines,
SUDOC:	C 22.11:6582
Series:	Information circular / United States Department of Commerce, Bureau of Mines ;
Report Number:	6582
Subjects:	Dredges--Pennsylvania--Pittsburgh
	Mining engineering--Pennsylvania--Pittsburgh
	Mines and mineral resources--Pennsylvania--Pittsburgh
	Mineral industries--Pennsylvania--Pittsburgh
Link:	https://hdl.handle.net/2027/mdp.39015074128193