Index of ftp://ftp.ftw.nrcs.usda.gov/practice-standards/archive/review-comments/521a-pond-sealing-or-lining-flexible-membrane
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construction-spec-geotextile-clay-liner
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construction-spec-hdpe
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d1
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d1-2004
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material-spec-geotextile-clay-liner
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material-spec-hdpe
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December 5 2013