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Pendersleigh & Sons' Official Map of City of Industry
Industry, as with Commerce (which is often referred to as "City of Commerce"), is often referred to as "City of Industry" to distinguish if from the common noun, "industry." Perhaps too it has the subtle effect of arguing for Industry's legitimacy as a municipality (and thus to hopefully disassociate it from "phantom cities" like Bradbury, Hidden Hills, Rolling Hills, Vernon, and the City of Commerce.)