Item XXV in Delisle 1884, p. 106: "une layette plusieurs cayers d'unes très riches heures que faisoient Pol et ses frères, très richement historiez et enluminez". The English translation (without the bracketed explanatory additions) is from Manion 1996, p. 308.
books.google.com
Camille 1990, pp. 73–74. Note, however, that in 2008, Timothy Husband, Curator of the Department of Medieval Art at The Metropolitan Museum of Art, reported that he was allowed to examine the manuscript at the Chantilly Library for "many uninterrupted hours" (Husband 2008, p. viii).