The Superintendent may at any time communicate to the Board that a particular book is unsatisfactory for the schools, whereupon the Board may call for a new selection and adoption. If the Board votes to change a textbook, it shall give the publisher 90 days’ notice prior to May 1, after which it may adopt a new book or books on the subject for which a book is sought. (1955, c. 1372, art. 24, s. 7; 1969, c. 519, s. 1; 1981, c. 423, s. 1.)