California Code, Public Contract Code - PCC § 20207.5

“Advertising” means the advertising and publication of all official reports, orders, ordinances, resolutions, notices inviting proposals, and all notices of every nature relating to work or business of the district.  Advertising shall not be classified.  No part or kind of advertising shall be charged or contracted for at a higher rate than any other part or kind is charged or contracted for, except in the case of the delinquent tax list.  The advertising of the delinquent tax list shall be let to the lowest responsible bidder on a separate bidding from all other advertising.  A square of advertising shall be 234 ems nonpareil.