70 ILCS 3305/7

All ordinances, orders, and resolutions and the date of publication thereof, may be proven by the certificate of the secretary under the seal of the corporation and when printed in book or pamphlet form and purporting to be published by the board of trustees, such book or pamphlet shall be received as evidence of the passage and legal publication of such ordinances, orders and resolutions as of the dates mentioned in such book or pamphlet, in all courts without further proof.