Rome: Editiones Calasanctianae, 1969. Oversized Paperback. xxxi, 1262 p.,softbound, 9.5x6.5 inch buff wraps, nearly 2.5 inches thick, edgeworn with creasing of upper corner-tips, a good copy. Text in Latin. Monumenta Historica Scholarum Piarum.
Collected letters of the Ordo Clericorum regularium pauperum Matris Dei Scholarum Piarum, which established a widely respected network of schools.