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Keywords:
WELLCOME TROPICAL RESEARCH LABORATORIES,
SLUICES,
MACHINERY,
IRRIGATION,
SCHEMES,
DAMS,
CANALISED,
CANALS,
GEOLOGY,
AGRICULTURE,
FLOODS,
FOUNDATIONS,
CRACKS,
MASONRY,
SOILS,
PILES,
SANDSTONE,
CHEMICAL,
PROPERTIES,
MINERALS,
COMPOSITION,
WATER,
BLUE NILE,
GEZIRA,
WHITE NILE,
SUDAN,
AFRICA
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© Thomas Telford and ICE
1929
