Section 50 Required books; copies of laws, etc.

Section 50. The books required by section forty-five shall contain a copy of this section, of sections forty-three, forty-four, forty-five, forty-six and forty-nine, and of sections eighty-four and ninety-four, and such certificates as are required by law to be signed by the assessors, with such explanatory notes as the commissioner considers necessary to secure uniformity of returns under the several headings.