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HARVARD Citation
Unknown (2010) The practical astronomer. [Online]. London New York : DK. Available from: http://access.bl.uk/ark:/81055/vdc_100039998646.0x000001
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Unknown (2010) The practical astronomer. [Online]. London New York : DK. Available from: http://access.bl.uk/ark:/81055/vdc_100039998646.0x000001