Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
snoR639NR_0019117227H1    snoH1    Dm-639    CR32884    snoRNA:H1   
snoR639NT_0337787227H1    snoH1    Dm-639    CR32884    snoRNA:H1   
snoR639AJ5440197227

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* OMIM link based on symbol match for human and mouse.

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Text2Knowledge ... Yong Huang 2002