The board of county commissioners may procure for its county certified copies of the field notes and plats of the original surveys by the United States of the lands within its county and may cause a map of the county to be constructed therefrom on a scale of not less than one inch [2.54 centimeters] to a mile [1.61 kilometers] laid off in congressional townships and sections. When obtained, such notes and plats shall be bound substantially in book form, and together with the map of the county, shall be deposited in the office of the county auditor and kept open for the benefit of the public.