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.
Photo Category: Coast and Geodetic Survey - Archive Climate Studies - Ice Studies
Photo Location: Massachusetts, Cape Ann to Gay Head
Photo Date: 1873
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| Added On | 20th October 2015 |
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