DTM Geophysical Laboratory Library DTM Views Album, Volume XXIV: Image 21 | ARC Archives Catalog
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DTM Geophysical Laboratory Library DTM Views Album, Volume XXIV: Image 21
Piers for magnetic-variation building showing 10' excavation, Carl Weller (hand) standing in bottom of hole. Removed forms shown in sections. Picture taken from a point 15' above ground. August 1932.
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