More online liturgica

Incidentally, if you're interested in online books, you might also find of interest on that site:

English Uses:

The Sarum Missal done into English
The Liturgy of the Church of Sarum
The Lesser Hours of the Sarum Breviary
The Ancient Liturgy of the Church of England, according to the Uses of Sarum, Banglor, York and Hereford, and the Modern Roman liturgy arranged in Parallel Columns

Other:
The Leofric missal as used in the Cathedral of Exeter during the episcopate of its first bishop, A.D. 1050-1072. Together with some account of the Red book of Derby, the Missal of Robert of Jumièges, and a few others.
The Rosslyn Missal: an Irish Manuscript
Breviary Hymns and Missal Sequences
The Old Catholic Missal and Ritual
The offices of the Old Catholic prayer-book, done into English, and compared with the offices of the Roman and old German rituals by F.E. Warren
Liturgica Historica by Edmund Bishop
The Liturgy and Ritual of the Ante-Nicene Church by F.E. Warren
The Liturgy and Ritual of the Celtic Church by F.E. Warren
Liturgies, Eastern and Western, being the texts original or translated of the principal liturgies of the church, by F.E. Brightman

Architectural:

Fifteenth and Sixteenth Century Ornaments, by AWN Pugin