| http://www.w3.org/ns/prov#value | - Referring now in detail to the drawings, and more particularly to FIGS. 1-4, 7, 8 and 11, the reference numeral 20 denotes an elongated solid web member which is to be sunk vibratorily vertically into the ground at the location where a subterranean fluid-impervious wall is to be formed.
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