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Study on the Impact of Industrial wastes at Helwan on River Nile Zooplankton: A Thesis Submitted to the Faculty of Science for the Degree of Doctor Philosophy (Zoology-Ecology) / Presented by Nehad Khalifa Sayed Ahmed; [Supervisors] Rasmy Boulos, Samira A. Salem, Naguib, Ahmed I.
- 577
- Ahmed, Nehad Khalifa Sayed.
- Cairo University,
- 2000.
- Cairo :