Perhaps some of you may find these PDFs of several chant research tools helpful, which may be found on Scribd.com:
https://www.scribd.com/doc/251183650/Hesbert-1935-Antiphonale-Missarum-Sextuplex
https://www.scribd.com/doc/251363109/Hesbert-CAO-3-Corpus-Antiphonalium-Officii-1968
https://www.scribd.com/doc/251395056/Hesbert-CAO-4-1970-Corpus-Antiphonalium-Officii
There are several other liturgical editions available here:
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