Terapia de locosOsvaldo Sauma Aguilar, Javier Sánchez Menéndez, Luis Chaves · First published 2017Open the Tome
Sistemas contablesChaves, Osvaldo A. ...[et. al.], Osvaldo Chaves, Juan Carlos Viegas · First published 2001Open the Tome
Contribución a la doctrina de la revolución paraguayaOsvaldo Chaves · First published 1971Open the Tome
