The boundaries of the zoning districts designated in Section 5-4-1 above are hereby established as shown on the maps entitled "Zoning Map: The City of Plano", dated June 25, 1979, which maps are made a part of this Zoning Title by reference and shall have the same force and effect as if the Zoning Map, together with all notations, references and other information shown thereon were fully set forth and described in this Zoning Title.