In order to carry out the authority granted in Kan. Stat. Ann. § 19-15,139, and for no other purpose, the board of county commissioners of Shawnee and Wyandotte counties may issue general obligation bonds of the county in an amount not to exceed $20,000,000. The board of county commissioners of Seward county may issue general obligation bonds in an amount not to exceed $5,000,000. No bonds shall be issued until the question of their issuance has been submitted to a vote of the qualified electors of the county at any county general election, school board election or special election called and held for that purpose, and a majority of the qualified electors voting thereon votes in favor thereof. The election shall be called and held and the bonds shall be issued, sold, delivered, registered and retired in the manner provided by the general bond law.