Opheim

1973

1:24k

Joint Map No. XV. United States Northern Boundary Commission. (Canadian Border).

1878

Campbell, A.

1:127k

Joint Maps of the Northern Boundary of the United States From the Lake of the Woods to the Summit of the Rocky Mountains

1878

NORTH AMERICAN BOUNDARY COMMISSION

1:127k

Opheim

1984

1:100k

Glasgow

1958

1:250k

No. III, Reconnaissance Map. (Big Muddy River to Fort Hawley).

1878

Twining, W.J.

1:507k

Joint Map Nos. I - XXIV. United States Northern Boundary Commission. (Canadian Border).

1878

Campbell, A.

1:127k

Williston Sectional Aeronautical Chart

1935

1:500k

Montana east.

1874

Asher & Adams

1:1m

Montana.

1875

Asher & Adams

1:1m