Drainage; Control of Sub-surface Water Management by Draining with Pipes, Open-ditch Drainage and Amelioration of the Subsoil; General Instructions and Special Cases— 17 стр.
Drainage; Control of Sub-Surface Water Management by Drainage with Pipes, Open-Ditch Drainage and Amelioration of the Subsoil; Design and "As Completed" Drawings— 2 стр.
