N.D. Cent. Code § 61-08-12

Bonds may be sold at private sale without notice or at public sale after a notice calling for bids has been published at least once in the official newspaper of each county in which the district is situated not less than fifteen days nor more than thirty days before the date specified for receiving bids. The notice may be in any form but must specify the amount of bonds offered for sale and the date or dates of the maturity thereof, and the notice must specify that the bids must be sealed and in writing and must state the time when and place where bids will be received and will be opened.