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keyword: Nebulae – 2 free books.
These books are available in PDF format - good for desktops, printing.
Proceedings of the 14th Arabic Conference of the Arab Union for Astronomy and Space Sciences
Hamid M. K. Al Naimiy et al. (editors)
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Photographs of Nebulæ and Clusters, Made with the Crossley Reflector
James Edward Keeler
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