APPROXIMATELY LOCATED IN OR AROUND THE LEVIATHAN MINING DISTRICT ; COPPER; SULPHUR; THE COPPER HANDBOOK; A MANUAL OF THE COPPER INDUSTRY OF THE WORLD; VOL. IV; FOR THE YEAR 1903; COVER AND PAGE 469; LEVIATHAN MINE (TEN MILES EAST OF MARKLEEVILLE; ALPINE COUNTY; CALIFORNIA); TWO TUNNELS OF 400' AND 700'; IN ALP ; AUTHOR: STEVENS, HORACE J.
