| http://www.w3.org/ns/prov#value | - However, since piling is an expensive means of supporting small structures, shal low weak clays can be a bigge r stumbling b lock to small construction projects than to large ones The map on this page shows the areas i n wh i ch firm clays have been found underlying surface sands, and areas in which soft clays or clays cbntain ing soft lenses have been encountered beneath the sands I n addition, a
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