The Facebook Liber Usualis Appreciation Society Group writes:

"The Liber Usualis (No.780, Desclée & Co.) is possibly the greatest book of Gregorian Chant ever published." 

For the true or would-be Latin Scholar or Gregorianist, it has been lovingly cherished by some monks or priests since 1932 who have kept the cover taped on with clear plastic but all the [1605]  pages are there and just a very few light markings made.  PHOTO is stock but text is very readable. 
he Liber Usualis ("The Usual Book") is the most complete book of chant you can buy for the Tridentine rites. The book contains all of the chant for every feast of the year as well as all special services such as burials, weddings, blessing of Holy Oils, ordinations and benediction. The volume also contains the common chants for the Divine Office and the ordinary chants for the Mass.
Although the traditional music books of the Church (the Graduale Romanum, the Kyriale, the Antiphonarium, etc.) were available separately, it is the Liber Usualis that puts under one cover virtually everything that a Gregorian choir would need in order to chant the Divine Office, including the Holy Mass.
The Ordinary Chants of the Mass are given with the eighteen standard Gregorian Mass settings and the Common Tones of the Mass.
Following are the Ordinary Chants of the Office, with their common tones. For Sundays, the hours of Prime, Terce, Sext, None, Vespers, and Compline are given, together with Lauds for Feasts. Since the traditional Breviarium Romanum (Breviary for the Divine Office) is now scare, the Liber Usualis could substantially stand in for private recitation of the Divine Office.
The majority of the Liber Usualis is taken up with the Proper of the Time, that is, the chants for the temporal cycle of the year, together with the Common and Proper of the Saints and Votive Masses. The complete Requiem and Exsequial services are also provided. At the end of book are highly useful chants for special occasions, such as Benediction of the Blessed Sacrament.
Concluding the whole is an Alphabetical Table of Introits, Graduals, Alleluia Verses, Tracts, Offertories, Communions, Antiphons, Hymns, Psalms, Canticles, and Responsories, followed by an Alphabetical Index of Feasts.
This edition of the Liber Usualis contains the traditional Roman Rite as it existed in 1932.
IMPRIMATUR:
Tornaci, die 31 Julii, 1932
J. Lecouvet, Vic. Gen.
 black  hardbound, approx 5" x 7.5" and 2 inches thick with gold-edged pages.

CONDITION:   Poor hard binding but good integrity of page matter.  A copy of this edition starts bids at $200 but I am asking for $100 because of new binding needed.  With a professional binder, it can be restored into excellent condition.   I will pay for shipping.
Sales are final.