Map of Virginia, Gold Hill, Devils Gate, American Flat gold & silver mining districts : state of Nevada / Higginson & Goldsworthy, civil & mining engineers ; W. Vallance Gray, lith.Higginson & Goldsworthy[1865?]"Entered according to act of Congress in the year 1865 by Higginson & Goldsworthy in the clerks office of the district court of the northern district of the state of California."Oriented with north toward upper right.Relief shown by hachures.cartographic