Then, and I think that I am asking this for a bunch of lurkers, what is the reason and use of these other sources? Why is Jeff not just using the two books that you say are all that you need?
Jeff, you have stumbled across a very complex problem. There are indeed many small errors in the "Lectionary for Mass for Use in the USA," but not all the examples you mentioned are errors. Some are intentional choices to use different translations, not always or only the NAB, as the basis of our Lectionary texts.
There are some typos in the 1969 Latin edition.
There are some typos in the 1970 USA edition.
There are some typos in the 1981 Latin edition
There are some typos in the 1998/2002 US edition.
There are typos both in the biblical references and in the printed texts.
Some typos from older editions were corrected in the more recent editions, but the more recent editions also introduce a few new errors.
Some discrepancies are not really typos or errors, but simply differences in the versification of various editions of the Bible (since the NAB, the Vulgate, the neo-Vulgate, and other editions unfortunately sometimes have different chapter and verse numbers for the same texts, and are sometimes even based on different ancient texts -- especially bad in the case of the book of Sirach!).
For the Psalms: the US Bishops and the Vatican officials did not like the revised translation from the New American Bible, so they decided to use a different version of the Psalms in the most recent edition of the Lectionary.
The rest of the Lectionary texts USUALLY follow the NAB translation, but some changes were made, esp. in the incipits (opening words) of the readings, to provide better context, such as for dangling pronouns.
So, to answer your question: WHAT TO DO?
1) Realize and accept the fact that nothing on earth is perfect, not even in the Church or in the Liturgy.
2) Use the texts as printed in the Lectionary for a particular Mass or particular day, even if that might be slightly different from a published Bible, or from another day on which the same text is used for another Mass.
3) Hope and pray that there will be fewer errors in future editions of the Lectionary, although we will never achieve perfection, as long as we are living on this earth.
I hope this answer does not disturb you too much, but that you can realize that none of the typos, errors, differences, or discrepancies really affect the core of our Faith.
Paxbook is offering the Ordo Lectionum Missae, and at 600 pages, it probably contains full texts.
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