Gareth Curtis & Andrew Wathey, 'Fifteenth-Century English Liturgical Music: A List of the Surviving Repertory', Royal Musical Association Research Chronicle, 27 (1994), 1-69. Revised version by James Cook and Peter Wright (2017).
Downloadable PDF here: Curtis-Wathey 1994 revised 2017
This comprehensive inventory of fifteenth-century sources and their contents was prepared for the EECM committee; it has been updated and published here by Peter Wright and James Cook with the kind permission of the authors and the RMA.