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 ... material at least as wide as the external diameter of the pipe, except insofar as undisturbed material obtrudes upon this area. Each layer, if dry, shall be moistened and then compacted by rolling or by tamping with mechanical rammers...  Highway Construction Practices in the State of Louisiana and Related Matters ... - Էջ 178 United States. Congress. House. Public Works - 1965 - 745 էջ Ամբողջությամբ դիտվող -
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