Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 1, § 4

The department of highways, in this chapter called the department, shall in the year nineteen hundred and thirty-five and in every fifth year thereafter inspect all monuments or other marks defining the location of the boundary lines of the commonwealth, and if any of them have been injured, displaced, removed or lost the department shall, in co-operation with persons duly authorized by the adjoining state, restore them or replace them with suitable stone monuments, and in the same manner set suitable stone monuments at points not properly marked where the state boundary is intersected by the boundary of any counties, cities or towns in the commonwealth or by a highway or railroad. If officers of adjoining states are required to make such inspection at other times, the department may co-operate with them.