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IC 958 is almost certainly NGC 5360. Swift's description ("eeeF, pS, iR; seen only by glimpses") fits, and his typically crude position is only 3 arcmin away from Marth's galaxy. The only concern I have is that NGC 5364 is in the field -- why didn't Swift mention that, too? So, colons go on the IC number.
Lacaille's catalogue
The Messier objects
Dunlop's catalogue
The Bennett objects
The Caldwell list
Named DSOs
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