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...other material. The boxes are then filled with dirt or sand, preferably with a front-end loader, to make a barrier resistant to small arms fire and shrapnel. They can be stacked or lined in double rows to pr...
...material. The boxes are then filled with dirt or sand — preferably with a front-end loader — to make a barrier resistant to small arms fire and shrapnel. They can be stacked or lined in double rows to provid...