A Bamberg astronomic theodolite used to determine astronomic latitude and longitude as well as determine gravitational deflection from the vertical.

Operating the Coast and Geodetic Survey historic copper plate printing press.

Newspaper article detailing work of the Coast and Geodetic Survey on the Salmon River, or as it is known, the River of No Return.

Letter from Carl Risvold to his sister-in-law during Salmon River Project, the River of No Return. Letter details communication and mail problems for remote geodetic work even in 1945.

Sophie Risvold with daughter Diane, holding down the homefront while Floyd Risvold worked on the Salmon River.

Letter from Floyd Risvold to his parents detailing the end of work on the Salmon River Project and some of the hardships.

Some of the scenery in northwest New Mexico. Shiprock, an old volcanic plug, with Navajo Indians in the foreground.

Aerial photograph of the Salmon River showing the rugged nature of the country. The triangle marks a triangulation station.

Aerial photograph of the Salmon River area showing the rugged nature of the country.

Measuring the baseline. Head of end tape.

Rear end of tape maintaining set tension. Measuring baseline.

A view of upper Cook Inlet from Anchorage.

Signal stand on Station Snowshoe. Sam White, destined to be famous bush pilot, is with his dog on the right.

Looking west off Station Snowshoe.

William King, lightkeeper, on his way to Station Iron.

Sam's first caribou of the season. Field parties in central Alaska lived off the land.

The camp on Station Clear after the first major storm of the year.

The return from Station Clear.

Chunilna Creek.

Crossing the Talkeetna River.

Sunset on Cook Inlet.

The Talkeetna River about 125 miles north of Anchorage.

Bill King at Curry after finishing the field season.

Bill King headed home from Alaska on the S.S. Alaska.

A triangulation diagram of the area covered during the field season of 1923.

A heliotrope on stand ready for work.

The camp on Iron Creek.

The observing tent and theodolite.

Bill King with Bill Scaife at Station Clear before the big snow.

Bill King in Alaska.

Bill King at camp at Pedernal.

At No Wood Creek area in north central Wyoming.

The camp at Pecos, Texas. The advent of automobiles on field parties.

The camp at Pecos, Texas. The advent of automobiles on field parties.

Letter from party chief William Scaife to Bill King offering work, travel money, and description of Alaska working conditions the coming year.

Letter from party chief William Scaife to Bill King offering work, travel money, and description of Alaska working conditions the coming year.

Camp at the Teagarden Homestead.

Survey team in Wyoming 1920.

Newspaper clipping detailing the work of the Coast and Geodetic Survey.

Newspaper clipping detailing the work of the Coast and Geodetic Survey.

Newspaper clipping detailing the work of the Coast and Geodetic Survey.

Newspaper clipping detailing the work of the Coast and Geodetic Survey.

Newspaper clipping detailing the work of the Coast and Geodetic Survey.

Newspaper clipping detailing the work of the Coast and Geodetic Survey.

Newspaper clipping detailing the work of the Coast and Geodetic Survey.

Field records required to produce a nautical chart.

Bilby 116-foot portable steel tower used in triangulation. These towers are built by 5 men in approximately 6 hours. Preparations are being made for dismantling this tower in this image.

A tractor train on the North Slope of Alaska.

Weather Bureau/U.S. Department of Commerce public affairs display. display. ION/RTCA/RTCM meeting at Astor Hotel.

U.S. Department of Commerce/ Coast and Geodetic Survey aeronautical chart display. ION/RTCA/RTCM meeting at Astor Hotel.