General Chart No. 11 from Cape Ann to Gay Head. From a Trigonometrical Survey.
Under Benjamin Peirce Superintendent. Noted that the shading on the chart
is intended to show different formations according to the thickness of the ice.
Image ID: cgs05307, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection Location: Massachusetts, Cape Ann to Gay Head Photo Date: 1873 Credit: NARA C&GS Colllection
Category: Coast and Geodetic Survey/Archive Climate Studies/Ice Studies/