When by section 19:14-27 of this title copies of an act of the legislature or of a constitutional amendment are required to be printed and mailed, the secretary of state shall cause to be printed and, at least twenty days before the election at which the question or proposition is to be submitted, shall deliver to each county clerk a number of copies of the printed matter to be mailed as hereinbefore required, at least twenty per cent greater than the number of registered voters in the county.
N.J.S. § 19:14-32