The Immaculate Heart of Mary is on p. 198 of Versus Psalmorum et Canticorum. The Magnificat, or Psalm 33 are indicated. (Psalm 33 is always appropriate.)
Thank you, Arthur, I totally missed it! I think my enlarged setting of the pdf was paging down to the next page without showing the bottom of the page. We can chant the Magnificat pretty much off the top of our heads, which is good because this is the first time we've been asked to chant for this feast and we'll only get one rehearsal.
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