The Survey ; For sale by the Survey ; North Dakota Water Commission,
Voltaire quadrangle, North Dakota--McHenry Co., 1948 : 7.5 minute series (topographic)
Voltaire quadrangle, North Dakota--McHenry Co., 1948 : 7.5 minute series (topographic)
Voltaire quadrangle, North Dakota--McHenry Co., 1948 :