"Liber IV, Distinctio 21, Quaestio 1" . . . . . . . . . . . . . . "4" . "Commentarius in libros Sententiarum, Liber 4, Liber IV, Distinctio 21 [Penn Transcription]" . "Utrum purgatorium sit" . "0001" . "wdr-l4d21q1" . . "0004" . . .