Sometimes saltpeter is present in such brines.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
The entire domestic tonnage is produced from brines pumped in Michigan, Ohio, West Virginia, and Pennsylvania.
"The Economic Aspect of Geology"
C. K. Leith
Bromine occurs in sea water in appreciable amounts, as well as in some spring waters and many natural brines.
"The Economic Aspect of Geology"
C. K. Leith