Collections
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#Early type YSO/YSOc by mboschmd (10 subjects)
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known #YSO and #YSOc by mboschmd (10 subjects)
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#Be-stars by miltonbosch (10 subjects)
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Hα emission-line stars by miltonbosch (10 subjects)
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known YSO by SolOmniaRegit (10 subjects)