It shall be the duty of every library authority to provide a comprehensive and efficient library service for all persons desiring to make use thereof, . . .
In fulfilling its duty under the preceding subsection, a library authority shall in particular have regard to the desirability—
(a) of securing, by the keeping of adequate stocks, by arrangements with other library authorities, and by any other appropriate means, that facilities are available for the borrowing of, or reference to, books and other printed matter, and pictures, gramophone records, films and other materials, sufficient in number, range and quality to meet the general requirements and any special requirements both of adults and children; and
(b) of encouraging both adults and children to make full use of the library service, and of providing advice as to its use and of making available such bibliographical and other information as may be required by persons using it; and
(c) of securing, in relation to any matter concerning the functions both of the library authority as such and any other authority whose functions are exercisable within the library area, that there is full co-operation between the persons engaged in carrying out those functions.