You are bidding on:

Liber Usualis 1956 printed in Belgium #780 book. Gregorian Chant Mass.

I believe it is in Latin, but not positive. 

The book is in very good shape. All pages intact. No taring or ripping anywhere.

4 cloth ribbon bookmarks in book.

Cover is black with a bit of dulling here and there, otherwise in very good shape. Binding is black with gold lettering "Liber Usualis"

All page edges are red and in very good shape. 

Handwritten pages on separate paper with the book include:

a 3rd page size musical staff, 

a 3rd page size: notes regarding book in English,

a full page size: more notes regarding book in English

a few pages from another book that appear to be more Greogrian chants.