An exemplification under the Great Seal of England, of an ordinance of His Highness the Lord Protector [electronic resource] : by and with the advice and consent of his council, dated the 26th of May, 1654. Entituled, An ordinance for the preservation of the works of the great level of the Fens; which ordinance was confirmed by one Act and Declaration made in the Parliament begun at Westminster the 17th day of September, an. Dom. 1656.