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	Rota Sludge & Stone Hammer drilling 1: Drilling Manual  textbook - 2005 - 33 pp Ed. ETC-Foundation - Leusden Practica Foundation - Papendrecht
	Rota Sludge & Stone Hammer drilling 2: Production Manual  textbook - 2005 - 23 pp Ed. ETC-Foundation - Leusden Practica Foundation - Papendrecht

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