There is hereby incorporated by reference for the purpose of establishing employee personnel rules and regulations the document entitled Personnel Manual.” No fewer than three copies of the documents shall be marked or stamped “Official Copy” as adopted by Resolution 601. The official copies shall be filed with the city clerk and shall be open to inspection and available to the public at all reasonable hours. All departments of the city shall be supplied with copies of such rules and regulations as may be deemed necessary. (Res. No. 601)