One or more sets of Zoning Maps entitled Current Official Zoning Maps shall be available for public reference in the Zoning Administrator's office or other location convenient to the public. Each map shall be identified by the signature of the Mayor attested by the Clerk of Council, and shall bear the seal of the City under the following words: "This is to certify that this is a part of the Current Official Zoning Maps referred to in Chapter 1113 of the Codified Ordinances of the City of Sylvania, Ohio."