The clerk of the circuit court for the county is hereby authorized and directed to change the system of indexing the records of his office, excepting the land records, and to index, or cause to be indexed or reindexed, according to some modern and accurate system, all of such records now on file in his office, except land records as aforesaid, and from time to time, to continue such system of indexing with regard to the current volume of work resulting from the usual course of business of his office. For this purpose the clerk of the circuit court of the county is hereby authorized to contract for the work of compiling such indexes, and for the installation of such modern system of indexing, and the verification of such indexes when made, and to purchase all books, racks, shelves and other equipment necessary for the purpose, and from time to time thereafter to purchase the necessary books, racks, shelves and other supplies and equipment to provide for the continuation of such indexing of the records resulting from the current volume of business of his office. The total cost of the work of indexing such records as aforesaid, and the cost of the necessary books, racks, shelves, supplies and equipment therefor, and the additions thereto made necessary from time to time by the current business of his office shall be paid out of the excess fees of the office of the clerk of the court. (Mont. Co. Code 1965, § 7-24; 1937, ch. 352; 1939, ch. 104, § 168A.)