Title from incipit, leaf a2r.
Imprint from colophon, leaf g3v: Tractatus de irregularitate vtile ac necessarium pro clericis per Gundissaluu[m] de villadiego sacri palacij auditore[m] editus feliciter explicit. Impressum Salmantice .vi. idus ianuarij per Leonardu[m] alemannm [sic]: [et] per fratrem Lupum sanz de Nauarra socios. Anno domini .M.cccc.lxxxxvi.
Printed in Hutz and Sanz's type 1:82G.
Signatures: a-f⁶ g⁴: 40 leaves, leaves a1 and g4 blank.
Paper format: Chancery folio.
PML copy leaf dimensions: 27 x 20 cm.
Contra haereticam pravitatem et De irregularitate
Hand decoration: Rubrication unrealized. Annotations: Contemporary marginal notations and keywords sporadically throughout in two hands.