REFERENCES
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- Hand Book of Ionospheric and Geophysical Reference Data (Radio Corporation Unit, Nat. Phys. Lab., New Delhi) 1962.
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- Rao, G. L. N, Ph.D. Thesis, Andhra University, Waltair, 1963.
- Rao, P. B., Ph.D. Thesis, Andhra University, Waltair, 1962.