Map illustrating the geological position of the Golconda gold mines / by C.H. Hitchcock ; to which has been added the railway connections by J.H. Colton.Hitchcock, Charles H. (Charles Henry), 1836-19191865]"Entered according to Act of Congress in the year 1865 by J.H. Colton ..."Inset: Map showing the distribution of the gold bearing rocks of eastern America / by C.H. Hitchcock.Relief shown by hachures.Shows selected geological features of Vermont and socartographic