Knife River flint is the official rock of the state of North Dakota.
State rock
N.D.C.C. § 54-02-21, under State Emblems, Symbols, and Awards.
N.D.C.C. § 54-02-21
N.D.C.C. § 54-02-21, under State Emblems, Symbols, and Awards.
N.D.C.C. § 54-02-21
Knife River flint is the official rock of the state of North Dakota.