Oratio De Triplici Fine In Scholis Perpetvo Conivngendo : Qva Conrectoris In Schola Oldenbvrgensi Mvnvs Clementissime Demandatvm D. XIX. Septemb. A.O.R. MDCCXXXVIII. Pvblice Avspicatvs Est / M. Georg. Christian. Ibbeken Oldenbvrgensis