The county clerk shall, at least 30 days before any election at which the electors are to vote on any county bond issue, serve a copy of said resolution on the sheriff of the county and the sheriff shall, at least 20 days before said election, cause to be posted in 2 of the most public and conspicuous places in each election precinct or district in the county notices of said election containing the full text of the resolution aforesaid. The county clerk shall also cause to be published in at least 1 newspaper having a general circulation in the county, one published in the county, if such there be, a like notice for 3 successive weeks immediately prior to said election. The county clerk shall also cause to be served on the clerk of each city, village and township a copy of said resolution, at least 30 days before the time fixed for the holding of said election. All municipal and township authorities shall take such action relating to said election as shall be necessary to provide for the holding thereof but no election called under the provisions of this act shall be construed as a special municipal election within the limitations of Act No. 278 or Act No. 279 of the Public Acts of 1909 and amendments thereto. The notice required to be posted by the sheriff and published by the county clerk shall be deemed sufficient notice of said election. All elections herein provided for shall be conducted, all votes shall be received and counted, and all returns shall be made in accordance with the general election laws of the state of Michigan, unless herein otherwise provided: Provided, Where in any bond issues heretofore approved, the giving and posting of the notices required by this section have been made in accordance with the provisions of Act No. 351 of the Public Acts of 1925, rather than as heretofore provided for in this section, the said bond issues and all bonds issued thereunder are hereby validated, approved and confirmed as to the giving and posting of such notices.