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Canyon crossing showing v-shaped canyon in the Aleutian Islands.

Canyon crossing showing v-shaped canyon in the Aleutian Islands. Photo

Cut-away view of plane table with alidade.

Cut-away view of plane table with alidade. Photo

A scene in Long Beach the morning after the devastating 1933 earthquak...

A scene in Long Beach the morning after the devastating 1933 earthquake. Photo

Views in the vicinity of Mt

Views in the vicinity of Mt Photo

Jack Bachtel and Lt

Jack Bachtel and Lt Photo

The two pack trains leaving Cash Bar

The two pack trains leaving Cash Bar Photo

A look into the canyon of the Salmon River from above.

A look into the canyon of the Salmon River from above. Photo

Crossing over one of the many rivers in central Alaska on a suspension...

Crossing over one of the many rivers in central Alaska on a suspension bridge Photo

The building crew at a triangulation tower in central Alaska

The building crew at a triangulation tower in central Alaska Photo

Triangulation crew used velocipedes when on the Anchorage to Fairbanks...

Triangulation crew used velocipedes when on the Anchorage to Fairbanks railway prior to heading into the wilderness for triangulation work Photo

Unidentified river in Alaska.

Unidentified river in Alaska. Photo

A tractor carrying fuel in central Alaska.

A tractor carrying fuel in central Alaska. Photo

Oscar Risvold after a season in the Alaskan wilderness on triangulatio...

Oscar Risvold after a season in the Alaskan wilderness on triangulation work. Photo

On the trail to Station Gardner.

On the trail to Station Gardner. Photo

End of truck travel at the ranch

End of truck travel at the ranch Photo

The day John "Red" Dana and Floyd Risvold went out to look for the bui...

The day John

Designated "upper lake", possibly Carlton Lake on the trail to Mt

Designated

Clearing out downfallen timber on the trail to Mount Lolo in the Bitte...

Clearing out downfallen timber on the trail to Mount Lolo in the Bitterroot Mountains Photo

Oscar Risvold at Station Vaca

Oscar Risvold at Station Vaca Photo

On the trail to Station Mogollon on the Mogollon Rim, a 25-mile horse...

On the trail to Station Mogollon on the Mogollon Rim, a 25-mile horse pack. Photo

Observing party on Station Kent near Las Cruces, New Mexico.

Observing party on Station Kent near Las Cruces, New Mexico. Photo

On the way to Station Lone Cone in Southwest Colorado

On the way to Station Lone Cone in Southwest Colorado Photo

Somewhere in the West

Somewhere in the West Photo

The lookout house at Station Atacosa

The lookout house at Station Atacosa Photo

Country on the Mexican border as seen from Station Atacosa.

Country on the Mexican border as seen from Station Atacosa. Photo

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