I don't know about other contexts but in the construction industry 'works' is common. I have worked in the industry in various guises for nearly ten years and it is used in certain circumstances, even if the 'works' are singular. ) Schedule of Works (the plan for the overall project) Looking in my Oxford Concise dictionary comes up with the confirmation that Works can mean 'operations of building or repair' so it does seem to be construction specific.
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