Suppose that we have a sample of steel or manganiferous cast-iron containing less than 7 per cent of manganese.
"Scientific American Supplement, No. 401, September 8, 1883" by Various
Great Britain alone imported 3,000,000 tons of high class, including manganiferous iron ores last year.
"Scientific American Supplement, Vol. XV., No. 388, June 9, 1883" by Various
MANGANIFEROUS IRON-ORE FORMATIONS FROM THE KARA SEA.
"The Voyage of the Vega round Asia and Europe, Volume I and Volume II" by A.E. Nordenskieold