Rota Sludge & Stone Hammer Drilling Part One. Drilling Manual Part 1 of this manual describes, step by step, how the Rota sludge and stone hammer method is used. HERWIJNEN, A. van (2005): Rota Sludge & Stone Hammer Drilling Part One. Drilling Manual. Leusden: ETC Foundation URL [Accessed: 11.03.2019] PDF
