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Description
Using dynamite to excavate a bench mark hole.Note dirt flying out of hole.Level party of H. J. Oliver (Image credit: C&GS; Special Report Oliver 1932)
Credit
C&GS; Special Report Oliver 1932
Display Date
1932
Location
Northern California
Collection
Historic Coast & Geodetic Survey
Geodesy
Determining the Elevations - Leveling a Continent
Keywords
Geodesy
Leveling