Protasius, thank you for responding. I think I need some strong direction here. This is the first year that we will be doing a sung EF Holy Week at our church, and I am in charge of trying to reconstruct it for the celebrant, choir, and myself. In the course of compiling the music, I have torched my brain as I sifted through pre-Pius XII reforms, the experimental version of the Easter Vigil (from 1951 to 1955), and the restored Holy Week liturgy of 1955. To the best of my extremely limited knowledge, the link which you sent is of the experimental 1951-1955 Psalm 116 and Magnificat? The restored rites of Holy Week (1955) changed the Lauds of the Easter Vigil to the use of Psalm 150 and the Canticle of Zachary. The missing pages 148-149 in Part I of the NOH are of Psalm 150 and the Et valde mane antiphon (the beginning and ending lines of these can be seen there).

Perhaps I need to go back to the drawing board and ask first questions, first: Am I even supposed to be using the 1955 restored Holy Week liturgy as my frame of reference? All help is welcome here!

Whatever was in force in 1962 is correct, so any changes between 1955 and 1962 should be incorporated.

The OMM book looks pretty good. Thanks for the info.

Between 1955 and 1962 the changes were made in the calendar (suppression of a few feasts, downgrading of the majority of the remaining, abolition of the system of Ferial days, Simple feasts, Semidouble feasts and Double feasts [subdivided in Double I. and II. class, Major Double and Double] and replacing them with I. to IV. class) and rubrics (omission of 2nd Confiteor, omission of Benedicamus Domino in Masses without Gloria [instead moving it to Masses followed by another liturgical action, i.e. almost never], omission of Prayers at the Foot of the Altar and Last Gospel in certain circumstances, shortening of matins lessons [resulting in incomplete and senseless patristic homily readings in some instances], omission of First Vesper of most Feasts, abolishing the old practice of only intoning the antiphons before a psalm in Little Hours and Matins, Lauds and Vespers on Ferias and Feasts in simple or semidouble rank).

If you are following the 1962, all the music can be found in the Liber on the Musica sacra website;
http://media.musicasacra.com/pdf/liberusualis.pdf
The above should be the text and arrangement of the liturgies as found in the above linked book for the Triduum.

The parts as sung by Priest / Deacon etc. can be found here;
http://www.fsspolgs.org/liturgical2.html

If you are going to be using the pre 1955, I can send pdf booklets for choir / congregation (we use the older form).

N.B. the major changes were made in 1955-1957, with further smaller changes up to 1962. It should also be noted that the revised NV psalms can be found in some books and the vulgate in others.

For much more information on the changes see this blog, and search for the entries on Holy week.

http://ordorecitandi.blogspot.co.uk/

Thank you both, tomjaw and Protasius, for the information that you are supplying me with. Very interesting.

Tomjaw, just doing a quick read of the link http://ordorecitandi.blogspot.co.uk/ that you supplied above, shows me how many changes were made, indeed, to the Holy Week. It included an answer to my question of whether the invocations in the Litany of the Saints are doubled or not: They used to be, but are no longer doubled. Taken from the 1961 Liber for which you included a pdf link above:
THE FIRST PART OF THE LITANY
18. When the Collect after the fourth Lesson is finished, all kneel. The
Litany of the Saints is sung without doubling the invocations...

Now, if anything changed between 1961 and 1962, please let me know.

I downloaded part VII of NOH and found there's no pages 70-71 in there (from chabanelpsalms.org). Does anyone have those two pages (Canticum Zachariae)?