Bonds issued pursuant to Sections 31 through 39 of this Act shall be payable solely from the revenues derived from the operation of the recreational facility or facilities or any combination thereof constructed, equipped, acquired, extended or improved in whole or in part with the proceeds of such bonds so issued for the facility or facilities and shall not in any event constitute an indebtedness of such forest preserve district within the meaning of any constitutional or statutory limitation. It shall be stated on the face of each such bond that the bond has been issued pursuant to Sections 31 through 39 of this Act, that it is payable solely from the revenues derived from the operation of such facility or facilities or any combination thereof constructed, equipped, acquired, extended or improved in whole or in part with the proceeds of such bonds so issued for the facility or facilities and that it does not constitute an indebtedness of such forest preserve district within any constitutional or statutory limitation.