For state aid to regional public libraries; provided, that the board of library commissioners may provide quarterly advances of funds for purposes under clauses (1) and (3) of
section 19C of chapter 78 of the General Laws, as it considers proper, to regional public library systems throughout each fiscal year, in compliance with the office of the comptroller's regulations on state grants; provided further, that notwithstanding any general or special law to the contrary, in calculating the fiscal year 2020 distribution of funds appropriated in this item, the board of library commissioners shall employ population figures used to calculate the fiscal year 2019 distribution; provided further, that the board shall provide funds for the continued operation of a single regional library system to serve the different geographic regions of the commonwealth and requiring that physical locations be maintained in both eastern and western Massachusetts to serve the residents of those regions; and provided further, that notwithstanding any general or special law to the contrary, the library of the commonwealth shall receive not less than 42.4 cents for each resident of the commonwealth