The Legislative Administrator shall classify and arrange the legislative records delivered to the Legislative Administrator pursuant to ORS § 171.415, in a manner that the Legislative Administrator considers best suited to carry out the efficient and economical utilization, maintenance, preservation and disposition of the records. The State Archivist shall assist the Legislative Administrator in the performance of this work. The Legislative Administrator shall deliver to the State Archivist all legislative records in the possession of the Legislative Administrator when such records have been classified and arranged. The State Archivist shall thereafter be official custodian of the records so delivered. [1961 c.150 § 3; 1969 c.620 § 11]