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ASTM D 4750 - 87 (reapproved 1993) ; ASTM D 4750 - 87 (Reapproved 2001) Standard test method for determining subsurface liquid levels in a borehole or monitoring well (observation well)
1) 1997 Annual Book of ASTM Standards. Section 4 Construction, Volume 04.08 Soil and Rock (I) 2) Annual Book Of Astm Standards 2006 Soils And Rock (i) Vol. 04.08
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