The SciencesOctober 1, 1939
Cuba-Key to Manganese Problem
Manganese Vital in Steel Manufacture, We Have None, War Would Cut Down Imports, Cuba Now Supplies Some, Momentous American Achievement
Stories by Richard B. Clarkson
Cuba-Key to Manganese Problem
Manganese Vital in Steel Manufacture, We Have None, War Would Cut Down Imports, Cuba Now Supplies Some, Momentous American Achievement