I’m currently in the process of creating a website where all the organ accompaniment booklets for Vespers are posted for download. At the moment, you can download the 25-page booklet I used yesterday, to accompany vespers for Sexagesima Sunday.
Pope Saint Paul VI (3 April 1969): “Although the text of the Roman Gradual—at least that which concerns the singing—has not been changed, the Entrance antiphons and Communions antiphons have been revised for Masses without singing.”