http://users.skynet.be/fc219947/top40pn/index.html
http://www.atlasoftheuniverse.com/plannebs.html
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NGC40, NGC1501, NGC2022, NGC2372, NGC2392, NGC2438, NGC2440, NGC3242, NGC6543, NGC6742, NGC6765, NGC6826, NGC7009, NGC7293
NGC7026, NGC7027, NGC7048, NGC7139