This book is essentially the exact same as the Liber Usualis (used by priests, monks, sisters and seminarians) except that it had been shortened from around two thousand pages to eight hundred. You could say it is the layman's Liber. The Liber Brevior is perfect for all small choirs that are forming today. It has two riibon markers.
With Rhythmic Signs of Solesmes [propers & ordinaries for Sundays, feast days & common of the saints] - Monks of Solesmes 2013 Nº 813 [reprint of 1954 edition].