Report of progress in the counties of York, Adams, Cumberland, and Franklin : Illustrated by maps and cross-sections showing the magnetic and micaceous ore belt near the western edge of the Mesozoic sandstone and the two Azoic systems constituting the mass of the South mountains. With a preliminary discussion on the Dillsburg ore bed, and a catalogue of specimens collected in 1875 / By Persifor Frazer, jr. Volume: C2 (1877)