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many roadways are surfaced with gravel in papua new guinea

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many roadways are surfaced with gravel in papua new guinea

5341 MAINTENANCE AND PREPARATION OF GRAVEL SURFACED ROADS 5342 SPOT GRAVELLING 5343 GRAVEL SURFACING SHEETING 5344 GRAVEL PAVEMENT POTHOLE PATCHING which is a Department of the Government of Papua New Guinea 511216 DRY DENSITY RATIO The percentage ratio of the field dry density of a material to the modified maximum

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