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Topography and geology of the phosphate district of Safâga (Eastern desert of Egypt) / By John Ball.
- 553.640962 B1871t
- Ball, John, 1872-1941.
- Government Press,
- 1913.
- Cairo :
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A brief note on the phosphate deposits of Egypt / by John Ball ...
- 553.640962 B1871
- Ball, John, 1872-1941.
- Government Press,
- 1913.
- Cairo :