Wyo. Stat. § 41-10-142
Any bonds issued under this act may be refunded without an election pursuant to a resolution or resolutions to be adopted by the board in the manner herein provided for the issuance of other bonds, subject to any contractual limitations. Refunding bonds so issued may be secured in such manner and may be made payable from such sources as was provided in the resolution or resolutions authorizing their issuance; provided, however, that the security for the payment of the refunding bonds shall not be greater than the security for the payment of the bonds refunded, nor shall there be pledged for the payment of the refunding bonds revenues which are not pledged for the payment of the bonds refunded. Refunding bonds so issued may be sold at public or private sale or may be exchanged dollar for dollar for the bonds to be refunded. If sold, the proceeds of sale may be escrowed for the payment of the bonds to be refunded in such manner as may be provided in resolution authorizing the refunding bonds.
W.S. 41-10-142