Additional comments: Abb. (?) Dawes: no information available. Could this be W. H. Dawes (see link)?
Click on the fingerprint to go to an overview page for that fingerprint
The reference lay-out is b-p-n with b = book number, p = page number and n = chant number
Click on the book number for more information about that chant book
Click on "p-n" to hear the midi (if your browser supports it)