File:1845 (?) Chart of Long Pond ; Chart of Spot Pond, by Henry Tracy under the direction of John B. Jervis, c.e. & Prof. W.R. Johnson, from the Digital Commonwealth - commonwealth cj82m655h.jpg
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![File:1845 (?) Chart of Long Pond ; Chart of Spot Pond, by Henry Tracy under the direction of John B. Jervis, c.e. & Prof. W.R. Johnson, from the Digital Commonwealth - commonwealth cj82m655h.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/0/0a/1845_%28%3F%29_Chart_of_Long_Pond_%3B_Chart_of_Spot_Pond%2C_by_Henry_Tracy_under_the_direction_of_John_B._Jervis%2C_c.e._%26_Prof._W.R._Johnson%2C_from_the_Digital_Commonwealth_-_commonwealth_cj82m655h.jpg/701px-thumbnail.jpg?20211222164022)
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