Frost work, Mt. Washington.

Frost work, Mt. Washington.

Summit of Mt. Washington, Winter.

Summit of Mt. Washington, Winter.

Observers taking water, Mt. Washington Railroad Tank.

U.S. Observatory, Mt. Washington.

Interior of United States Observatory, Mt. Washington.

Interior of U.S. Observatory, Mt. Washington.

Summit of Mt. Washington.

Summit of Mt. Washington.

Summit of Mt. Washington.

Summit of Mt. Washington.

Summit of Mt. Washington.

Summit of Mt. Washington.

Summit of Mt. Washington.

Summit of Mt. Washington.

Mt. Washington Summit House.

View from Mt. Washington Summit House.

View from Mt. Washington Summit House.

View from Mt. Washington Summit House.

View from Mt. Washington Summit House.

Mt. Washington Summit House.

Mt. Washington Summit House.

Mt. Washington Summit House.

Mt. Washington, from the Depot.

Frost work on Railway, Mt. Washington.

Frost work on Mt. Washington Railway.

Frost work on Mt. Washington Railroad.

Frost work on Mt. Washington Railway.

Frost work on Railway, Mt. Washington.