On the trail to Station Lazaro.

Packing up a shear cliff. Party off WILDCAT.

I sure wish they'd put these stations in easier places. Party off WILDCAT.

Packing up Snow Mountain. Reconnaissance party of William Musseter.

2-man observation party. Herman Odessey on left, Walter Bilby on right. Triangulation party of Herman Odessey

Resting part way up to Station Armada. Time for a snack. Astro party of Ector B. Latham.

Observer Thomas and pack. Triangulation party of Wilbur A. Porter.

Observing party on the way to Longs Peak. Triangulation party of Frank G. Johnson.

After descent of Laramie Peak.

Fording a stream. Triangulation party of William M. Scaife.

Packing up. Triangulation party of William M. Scaife.

Cold day- cold horses --- near Station Schist. Nearing the end of the season. Triangulation party of William M. Scaife.

Pack train at the top of Mauna Loa. Astro Party of E. J. Brown. World Longitude Network.

"Getting Out" - Horses helping horsepower. Level party of Herman Odessey.

Wrangler with horses on 49th Parallel. Triangulation party of Ector B. Latham. Boundary survey of U.S. - Canada border.

Jasper Bilby with light reconnaissance buggy. Reconnaissance party of Jasper Bilby. The 98th Meridian survey was the first great North-South arc in the U.S.

Two kinds of horsepower. Crossing the Red River near Granite, Oklahoma. Triangulation party of E. O. Heaton.

Going to work by horse and oxcart. Believed to be Roland Horne on horseback.

Slogging through the snowfields. The "country behind Station Twin". Triangulation party of William M. Scaife.

Spring reconnaissance with pack-dogs after leaving the railroad at Cantwell. Each dog could carry about 30 pounds. Triangulation party of William M. Scaife.

Fording a small stream with pack-dogs after leaving the railroad at Cantwell. Each dog could carry about 30 pounds. Triangulation party of William M. Scaife.

The trip across the snowfields. Triangulation party of William M. Scaife.

Spring reconnaissance in the Broad Pass District. After leaving the railroad at Cantwell. Triangulation party of William M. Scaife

Dog sled trip up the 141st Meridian to the Arctic Ocean. International Boundary Party under Assistant John H. Turner. Traveled from Porcupine to Arctic Ocean and back in 18 days. A round trip of over 400 miles --- lowest temperature was -50 Fahrenheit. March 27 to April 14, 1890

Traveling by human power - rickshaw ride in the Orient. On the way over to the Philippines.

Hubert Paton and Bloomberg in a Cebu cart. Shore leave in the Philippines.

Idyllic day on the Yukon River. Reconnaissance party of Sam O. White.

Climbing up 110' rock near McArthur Pass. Survey crew off SURVEYOR.

Landing at Station "Steep". Survey crew off SURVEYOR.

Climbing to station. Survey crew from WILDCAT.

Large stern-wheel boat bringing supplies. Level party of Fred E. Joeckel.

The boat was transportation for the level party. Camp in Glen Canyon. Level party of Fred E. Joekel

Bear Creek Canyon, Portage Glacier. Note canoe for scale of glacier. Party of R. P. Strough

Shovel-nosed river boat providing transportation. Triangulation party of William M. Scaife.

Shovel-nosed river boat providing transportation. Triangulation party of William M. Scaife.

River boat MIDNIGHT SUN used to transport supplies on the Yukon River. Used to supply crews on the 141st Meridian. Work on the Alaska-Canada Boundary

Using local inter-island ferry service.

U.S.S. SHERMAN - Army transport to Philippines.

Survey party on International Boundary. Triangulation party of J. F. Pratt

Working a boat through the ice of Glacier Bay. Triangulation party of Fremont Morse

River boat among icebergs in Twin Lake. Triangulation party of William M. Scaife

Hauling skiff up the rapids. Triangulation party of William M. Scaife

Portage on Basswood River. 125 miles of reconnaissance in 5 days

A bad fall on the way to Station Gallatin. Idaho-Montana 1922. Triangulation party of William M. Scaife

Result of the fall - micrometer arm of theodolite broken off. Idaho-Montana 1922. Triangulation party of William M. Scaife

In climbing to Station Gallatin, the horses took some bad rolls. Idaho-Montana 1922. Triangulation party of William M. Scaife

On the way to Station Gallatin. Bad country for horses Triangulation party of William M. Scaife

On the way to Gallatin Peak - high peak to left. Where do we go from here? Triangulation party of William M. Scaife

No more horse packing. Observing party on the side of Gallatin packing up

Observing party leaving Pony, Montana, for Station Jefferson. Heading for peak to left in picture