Report copyright - 調査結果の整理- 4 - (a)橋梁数 (b)構成比 平成8年度調査←→平成18年度調査 52 80 53 68 53 43 63 62 70 64 49 58 50 57 46 36 33 31 93 112 92 77 95 98 80 70 74
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