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Davis, C.

Mason, K.G. & Davis, C., 1993. Simultaneous casing drilling system. , pp.p. 8-9, 13: 2 fig., photogr.

Fecha publicación: 30/12/2004

Davis, C. & Vaish, D.P., 1993. Construction of handpump-equipped wells at high altitude : learning from non-governmental organizations. , pp.p. 10-11: 1 fig., photogr.

Fecha publicación: 30/12/2004

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