The English Quadrant in Europe: Instruments and the Growth of Consensus in Practical Astronomy - J. A. Bennett, 1992
Chemical Engineering Progress 1954-12: Vol 50 Iss 12 : Free Download, Borrow, and Streaming : Internet Archive
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PDF) Calculating the variations of sunrise, sunset and day length times for Baghdad city.With comparison to different regions of the world in year 2019
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