资源 标记: Excavation
1 条目已找到 (正在显示 1 - 1)
-
1996-01-01 The text covers two basic designs of eath road called, for convenience 'village' and 'market' roads; definitions based on levels of usage, from a few vehicles per day or week (village), to perhaps 50 vehicles per day (market). The text describes the drainage principles and techniques; route...