Collections
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#Early type YSO/YSOc by mboschmd (10 subjects)
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Probable/Definite New #YSOc by miltonbosch (10 subjects)
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Hα emission-line stars by miltonbosch (10 subjects)
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YSO by joshua5 (10 subjects)
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S2 Early and mid-type stars by artman40 (10 subjects)