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Scheme: ABCD EFG Pencil.png
Collection: EFG SiteStratigraphy Pencil.png
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DrillMethod (also /SiteStratigraphy/SiteSections/Borehole/DrillMethod): How the borehole or well was drilled e.g. reverse circulation drilling, diamond coring, percussion drilling, auger drilling, rotary/barber drilling etc.

Constraints in the context of ABCD EFG: