N.D. Cent. Code § 11-20-09
The original field notes shall be taken and set down in the manner in which field notes of the United States surveys are kept and shall contain all of the details of each survey in the order in which the survey was made. The notes shall include in full all calculations made by the surveyor to determine areas or to measure inaccessible distances, such as lake and river crossings, or for any other purpose required by the survey. Diagrams may be used for purposes of illustration but shall not be used instead of the written notes required to be kept. The field notebook shall contain the certificate of the surveyor who made the surveys stating that the field notes therein contained are the complete original field notes of the surveys therein referred to and described.
N.D.C.C. § 11-20-09