Okla. Stat. tit. 62, § 62-758: Issuance of combination of bonds

Any refunding bonds and bonds for any other purpose authorized

by law may, in the discretion of the governing body, be issued

separately or in combination in one or more series by the public

body, subject to the same limitations provided for in subsection C

of Section 4 of this act for combined refunding of two or more

outstanding obligations.