(a) It shall be lawful for the board of assessment to enter into an agreement with the proper authorities of any city, town or municipality to inspect and copy any assessment made for local purposes. If in the opinion of a majority of the Board such local assessment assesses all property at its true value in money, then the board may adopt such local assessment as the assessment for county purposes.
(b) In making the capitation assessments, the boards are authorized to examine the assessment lists of towns, cities and school districts, and the books of registered voters of the preceding election, in order that no person may be omitted from the assessment lists.