N.D. Cent. Code § 54-30-04
Each issue of bonds must be designated by series figure or figures, or by series letter or letters, or by a combination of both figures and letters, and such designation must be different from that of every other issue. All mortgages securing the bond issues must be given a series designation. Each of the bonds so issued must contain a recital that it is secured by real estate first mortgages deposited with the state treasurer of North Dakota under this chapter which may be cited as the Second Real Estate Bond Act of North Dakota. The bonds must be executed by the governor and the state treasurer under the great seal of the state and must be attested by the secretary of state. The state auditor and the secretary of state shall endorse and sign on each bond issued a certificate showing that it was issued pursuant to law and is within the debt limit. The bonds so issued must be designated "bonds of North Dakota, real estate series".
N.D.C.C. § 54-30-04