Whenever a law library, and a board of trustees to govern the same, is in existence under the provisions of any law, other than the law superseded by this chapter, in any county, or city and county, in this State, this chapter shall not be considered a repeal of any legislation under which such library was established and is now governed, but shall be deemed to confer upon such library the benefits of Sections 6321, 6322, 6322.1, 6326, 6341, 6345, 6346, 6346.5, and 6347.