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WESTDAHL in Glacier Bay.
WESTDAHL in Glacier Bay.
Crew of the Coast and Geodetic Survey Ship WESTDAHL
Squirrel signal designed and whitewashed by WESTDAHL crew
Anchor signal designed and whitewashed by WESTDAHL crew
Snake and moonshine signal designed and whitewashed by WESTDAHL crew
The Coast and Geodetic Survey Ship WESTDAHL in front of Taku Glacier.
Shoran antenna on Cape Wrangell.
Pulling Shoran Station equipment and supplies up Cape Wrangell Peak du...
Shoran trilateration network using baseline crossing technique as note...
First use of electronics for precise distance measurement
Observing stand
Leveling party
Caspar Durgin's party somewhere in eastern Colorado or New Mexico
Surveying on the California coast
Magnetic observations at sea aboard the Coast and Geodetic Survey Stea...
Projection ruling machine of the U.S
Westinghouse sidescan sonar system towed by USC&GS SURVEYOR in summer...
Side scan sonar image corrupted by thermocline.
Side scan sonar image
Side scan sonar image of vessel on seafloor.
Side scan sonar image
Side scan sonar image of biological noise in the water column caused b...
Side scan sonar image of a pile of coal dumped on the seafloor.
Side scan sonar image of vessel on seafloor.
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