The board shall issue a certificate certifying as a professional librarian any person who requests certification upon a form prescribed by the board and who fulfills one or both of the following requirements:
The board shall issue a certificate certifying as a sub-professional librarian any person who requests certification upon a form prescribed by the board and who, in the opinion of the board, is qualified to practice library work in a position not requiring the educational and other qualifications for certification as a professional librarian.
Mass. Gen. Laws ch. 78, § 29