20 alaw a dawns = 20 songs & dances : casgliad o alawon gwerin, alawon telyn, emynau a dawnsiau / golygwyd gan W.S. Gwynn Williams.
Williams, W. S. Gwynn
Staff and tonic sol-fa notation. - Words and explanatory text in Welsh and English. - Arr. W.S. Gwynn Williams and others. ; Publ. no.: 8401 ; Unpriced (c821004)
BCM record number: B83-50068 :