It shall be the duty of the state librarian to exchange with such nations, states, municipalities, institutions, and persons outside the state as may confer a corresponding benefit, copies of the laws, law reports, reports of departments and institutions, and all other books and pamphlets published by the state, and to distribute these publications to such other nations, states, municipalities, institutions, and persons outside the state as may, by law, be entitled to receive them. Nothing in this section shall be construed to prevent any department from distributing its own publications. Distributions to, or exchanges with, states shall be with the state libraries or the authorized exchange agencies of the states.