Leveling in Mississippi. Rodman in depression requiring low instrument setup. Level party of H. J. Oliver

Determining sea level - just kidding! Rodman at bench mark covered by floodwaters. Mississippi River flood of 1935

The Basic Bench Mark at Pensacola. Level party of H. J. Oliver

Desert Shadows. Leveling across a dry lake bed

The travails of a bench mark setter. Level party of William Gibson

Another episode in the life of a bench mark setter. Problems digging a hole. Level party of William Gibson

Level work along a new highway route. Level party of William Gibson

Fording a river during level work for a new highway route. Level party of William Gibson

Leveling over the Tennessee River Bridge. Level party of William Gibson

The party that made 329 setups in 7 hours and 55 minutes. Working in area of extreme grades. Level party of H. J. Oliver

Leveling on a cold winter's day. Level party of William Gibson

Carrying the fire bucket for cold fingers and frozen fountain pens. Level party of William Gibson

A seven observing party level party with its trucks and equipment. Level party of William Gibson

Observing in the Boundary Waters area of Minnesota. Level party of J. D. Thurmond

Leveling along the Loon River. Level party of J. D. Thurmond

Rodman driving footpin for rod while submerged. Level party of J. D. Thurmond

Leveling along the trail to Prairie Portage. Level party of J. D. Thurmond

Level party at Whisky Pass, 12,800 feet. Level party of Gilbert R. Fish

Level party at Whisky Pass, 12,800 feet. Level party of Gilbert R. Fish

Level party at Whisky Pass. Level party of Gilbert R. Fish

Level party in New York City. Level party of Charles D. Meaney

Extent of 1st and 2nd order level net as of July 1, 1936. W.P.A. computation party of Ralph Pfau

Leveling - river crossing on the lower Mississippi River. Level party of Karl Jeffers

Leveling - river crossing on the lower Mississippi River. Level party of Karl Jeffers

Leveling on the "low line" at Hoover Dam. Level party of Emmett Sheridan

Leveling at Mormon Mesa, Lake Meade area. Level party of Emmett Sheridan

Leveling on the "low line" at Hoover Dam. Note Hoover Dam in background. Level party of Emmett Sheridan

Leveling - scene of Colorado River crossing near Overton. Level party of Emmett Sheridan

Rodman holding rod steady for observations. Bench mark as seen from highway. Level party of Gilbert C. Mast

Level unit traveling along Glenn Highway. Level party of Gilbert C. Mast

Level observations along the Salmon River. Note rod just to right of umbrella. Level party of Ira Rubottom

Fording river during the course of the day's leveling. Level party of Ira Rubottom

A typical instrument position during Salmon River leveling. Level party of Ira Rubottom

A typical rod position during Salmon River leveling. Level party of Ira Rubottom

Instrument man signaling rodman to move to left. Level party of Ira Rubottom

Bench mark setters transportation during Salmon River leveling. Level party of Ira Rubottom

Leveling through the snow. Level party of Ira Rubottom

Leveling through the snow. Level party of Ira Rubottom

First order level observations in Brazil. Special training mission of Joseph Lushene

Zeiss level instrument at the Instituto Geographico Militar. Special training mission of Joseph Lushene

Leveling upper mark with accuracy only to cms. Special training mission of Joseph Lushene

Level party crossing bayous near Dugdemona River. Level party of R. C. Darling

Not the best bridge, but it will work. Level party crossing bayous near Dugdemona River. Level party of R. C. Darling

C. F. Ellingwood recording during leveling of White House. Level party of Howard Rappleye

E. J. Parkin observing levels at White House, South Portico. Level party of Howard Rappleye

Leveling operations on Anacapa Island. Carrying elevation from bench mark up vertical cliff. Note steel tape. Level party of Lorne G. Taylor

Leveling operations on Anacapa Island. Carrying elevation from bench mark up vertical cliff. Note steel tape and lighthouse in background. Level party of Lorne G. Taylor

Leveling operations at the White House. Level party of Howard Rappleye

Teaching Liberians precise leveling techniques. Party of George Morris

Mechanized level crew moving up. Level party of Emerson E. Jones