Spencer North

1972

1:24k

Spencer South

1972

1:24k

Dubois

1983

1:100k

Dubois

1958

1:250k

Dubois

1958

1:250k

Dubois

1955

1:250k

Dubois

1955

1:250k

Dubois

1955

1:250k

Dubois

1955

1:250k

Parts of Idaho, Montana and Wyoming territories

1871

Geological Survey of the Territories (U.S.)

1:634k