A map from 1922 of Montana showing the capital of Helena, major cities and towns, Indian reservations, railroads, rivers, lakes, and mountains. The boundaries of Yellowstone National Park, primarily in Wyoming, are shown.

A map from 1909 of Montana showing the capital of Helena, major cities and towns, Indian reservations, railroads, rivers, lakes, and mountains. The boundaries of Yellowstone National Park, primarily in Wyoming, are shown.

A map from 1892 of Montana showing the capital of Helena, counties and county seats, major cities and towns, Indian reservations, railroads, rivers, and mountains. An inset map details Yellowstone National Park, primarily in Wyoming.

A map from 1919 of Montana showing the capital of Helena, counties and county seats, major cities and towns, Indian reservations, railroads, rivers, and mountains. An inset map details Yellowstone National Park, primarily in Wyoming.

A map from 1920 of Montana showing the capital of Helena, counties and county seats, major cities and towns, Indian reservations, railroads, rivers, and mountains. The boundaries of Yellowstone National Park, primarily in Wyoming, are...

A map from 1920 of Montana showing the capital of Helena, counties and county seats, major cities and towns, Indian reservations, military reservations, railroads, rivers, and mountains. The boundaries of Yellowstone National Park,...

A map from 1914 of Montana showing the capital of Helena, counties and county seats, major cities and towns, Indian reservations, military reservations, railroads, rivers, and mountains. An inset map details Yellowstone National Park,...

A map from 1920 of Montana showing the capital of Helena, counties and county seats, major cities and towns, Indian reservations, military reservations, railroads, rivers, and mountains. The boundaries of Yellowstone National Park,...

A map from 1904 of Montana showing the capital of Helena, major cities and towns, railroads, rivers, and mountains. The boundaries of Yellowstone National Park, primarily in Wyoming, are shown. "Montana was organized as a Territory in...