SkirpR: Any chance you could scan it and post it here? It would save trying to get the Liber Hymnarius on interlibrary loan. The text is:
Míssus est Gábriel Angelus ad Maríam Vírginem desponsátam Jóseph, núntians éi vérbum; et expavéscit Vírgo de lúmine: ne tímeas, María, invenísti grátiam ápud Dóminum: † Ecce concípies et páries et vocábitur Altíssimi Fílius. V. Dábit éi Dóminus Déus sédem Dávid pátris éjus, et regnábit in dómo Jácob in aetérnum. † Ecce.
I have found Felix namque es in the Antiphonale 1949; however, this had a slightly different version of Beata es, with slight variations such as te/ti differences.
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