The board may provide libraries for its schools and may purchase books, bookcases, and other things necessary therefor, and shall pay the cost of such libraries out of school funds of the county. In connection with any such school library, the board may employ a full-time librarian or may require one of the teachers at the school to serve as a part-time librarian. Any such full-time librarian or any such teacher-librarian, who holds a degree in library science based upon the successful completion of a full year of graduate work at an institution qualified and approved to offer such degree, and who holds a collegiate elementary, first-class high school, or other certificate of equal rank, shall be paid the same salary as is prescribed by law for teachers holding a master's degree.
The board shall have authority to employ during the vacation period a librarian for any school having a library of one hundred or more volumes, and to pay such librarian out of the school funds of the county an amount to be determined by the board. Any librarian so appointed shall keep the library open at least one day a week, at which time the patrons and pupils of the school may draw books from the library under such rules and regulations for the care and return thereof as the board may prescribe.