Statistics for occurrence #1 of “Merrimac River” in chapter 12 of Historic leaves, volume 2, April, 1903 - January, 1904:
...tual elevation, when afterwards surveyed by a practical engineer, was found to be 104 feet. By the original survey from Billerica to Chelmsford, the surveyor says, ‘The water we estimate in the Merrimac River at sixteen and one-half feet above that at Billerica Bridge, and the distance six miles,’ when in fact the water at Billerica Bridge is about twenty-five feet above the Merrimac at Chelmsford.
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