Magnetic Taconite Mesabi Range 21w

MARSDEN, R.W. ESTIMATION AND EVALUATION OF THE IRON ORERESERVES OF THE UNITED STATES - A PARTIAL SURVEY 1974-75. IRON ORE RESERVES OF THE MESABI RANGE, MINNESOTA.A MINERALS AVAILABILITY SYSTEM REPORT. BUMINES OFR109-80, 1980, 81 PP.; NTIS PB 80-228984.# TONNAGES REPORTED BY MARSDEN, NO MATTER WHAT THE UNIT# DESIGNATION, WERE ASSUMED TO BE IN LONG TONS BECAUSE# OF THE INCONSISTENCY OF UNITS IN HIS REPORT AND HIS# EXPLANATION THAT HE MADE NO CONVERSIONS TO METRIC# TONS BECAUSE OF THE GENERALIZED NATURE OF THE DATA.