John C. Smock, State Geologist; C.C. Vermeule, Topographer. 1 map on 6 sheets : col. ; 154 x 177 cm., on sheets 85 x 65 cm. Scale [1:63,360]. 1 mi. to 1 in. Also shows topography. Relief shown by contours and spot heights. Depths shown by isolines and soundings. Northwest sheet -- North central sheet -- Northeast sheet -- Southwest sheet -- South central sheet -- Southeast sheet.