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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 :
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The Nile Basin / by H.E. Hurst, R.P. Black and Y.M. Simaika.
- 916.2 H9664 1946
- Hurst, H. E.
- Govt. Press,
- 1946-1950.
- Cairo :