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A discussion of the observations on atmospherie electricity at Helwan observatory from march 1906 to february 1908 / by H.E. Hurst.
- 551.563 H9664
- Hurst, H. E.
- National Printing Department,
- 1909.
- Cairo :
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Measurement of the volumes discharged by the Nile during 1905 and 1906 / by E. M. Dowson ; with a note on rating formulæ for current-meters by J. I. Craig.
- 551.483
- Dowson, Ernest, 1876-
- National Printing Department,
- 1909.
- Cairo :