Any district having made provision for such collection of district taxes by the county officers, and desiring to revert to the plan of collection of district taxes by the district treasurer, may do so by adopting a resolution revoking such former resolution providing for collection by the county officers and furnishing copy thereof to the county auditors of each county in which any part of the district lands are located, except that in the case of any district which may have entered into contract with any of the purchasers of its bonds or obligations, or their representatives, or with the United States, providing for collection by the county officers, or have caused to be printed or indorsed upon any of its bonds a statement that the collection of the funds for the payment of the principal or interest thereof, will be made by the county officers, then such resolution providing for collection by the county officers shall be irrevocable until such obligations of the district have been paid.