This vast reference work contains 554 official documents of the Church issued from the time of the Second Vatican Council up to 1979. These decrees and instructions define the basic principles that have updated Catholic public worship the last 25 years. Grouped under seven major headings - General Principles, The Eucharist, The Other Sacraments and the Sacramentals, The Divine Office, The Liturgical Year, Music, and Art and Furnishings - the documents are comprehensively cross-indexed. This is an absolutely indispensable reference for anyone interested in the liturgical renewal.