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Filters: Keyword is drilling rigs and Author is Roark, P.  [Clear All Filters]
1989
P. Roark, Webster, M., y van der Geest, F., «Emergency technical assistance to Botswana for rural water supply», vol. no. 269. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. iii, 89 p.: photogr., 1989.
1988
P. Roark y Preble, R. E., «The selection of drilling rigs for rural water supply», vol. NO. 42. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. VII, 131 p.: fig., tab., 1988.
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