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Thanks for the replies. Parkwood, I use the Night Sky Observer's guide almost exclusively at the moment. I find the charts quite up to the job. I also have Tirion's SkyAtlas 2000, but don't often need to use it. I still occasionally use "the Sky" software that came with my first Tasco telescope if I'm looking for something that's not in NSOG but this is rare. If I'm hunting Arp galaxies I use "the arp atlas of Peculiar galaxies" and I find that its charts are also quite adequate. Many of the fainter Arps are not in the NSOG.
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