California Code, Education Code - EDC § 18310

For the purposes of this chapter a unified school district has all of the powers and duties of a union high school district.  A library district may be formed upon the application of 50 or more taxpayers and residents of any unified district, and after an election, in the manner prescribed by this chapter for the formation of a library district upon the application of taxpayers and residents of a union high school district.  If the requisite number of votes cast at the election are in favor of a unified school district library district the board of supervisors shall by resolution establish the library district and place the district in the control of the governing board of the unified school district.