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No doubt many of you already know about this but I came accross this free ebook and I thought some of you might be interested ... The book has 188 pages and includes around 70 odd black and white images of nebulae and clusters captured in the few years at the end of the 1800s and early 1900s. One example is plate 55, the Trifid Nebula The ebook can be downloaded for free from : http://www.gutenberg.org/ebooks/36470