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Water softening and purification : the softening and clarification of hard and dirty waters / by Harold Collet.
- 628.1
- Collet, Harold.
- E. & F. N. Spon,
- 1908.
- London :
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The standardization of the magnetic instruments at Helwan observatory during 1907 / by H.E. Hurst.
- 522.1 H9664
- Hurst, H. E.
- National Printing Dept.,
- 1908.
- Cairo :