A survey of approximately 3,000 miles of traverse off the Pacific coast of Oregon and Washington was carried out in the summer of 1964. The instrumentation was the LaCoste and Romberg mobile gravity meter using the suspended system and horizontal accelerometers for Browne corrections. The work was controlled by occasional observations with an underwater gravity meter on bottom. Precision of results can be evaluated by comparison with these observations and by gravity differences at intersecting traverses. The paper will describe the operation, present a sample traverse and map area, and will include an evaluation of the precision of the observations.

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