United States Coast Survey1 map : col., mounted on cloth ; 22 cm in diam., on sheet 56 x 48 cmRelief shown by contours."C. S. Pierce, Assistant in charge of party.""3030."JPEGG 3762 .H6 1875 .M300086219639015091903818_01engPublicTwo miles around the pendulum station on Hoosac Mountain near central shaft of tunnel, Massachusetts, 1874MapsMassachusetts--Hoosac TunnelMassachusettsUniversity of Michigan