The principal of, the interest on and any prior redemption premiums due in connection with the bonds shall be payable from, secured by a pledge of and constitute a lien on the revenues out of which such bonds shall be made payable. In addition, they may, in the discretion of the county, be secured by:
No county is authorized to pledge any of its property or otherwise secure the payment of any bonds with its property, except that the county may pledge the property of the project or the revenues therefrom.
NRS 244A.717