Old testament [Hebrew]. 8vo.  

Old testament [Hebrew]. 8vo. Either 'Biblia hebraica, sine punctis', Amsterdam, 1630, 8vo, or 'The old testament in Hebrew', Amsterdam 1630.

Olympia, Pythia, Nemea, Isthmia [Greek and Latin]. 4to.  

Olympia, Pythia, Nemea, Isthmia [Greek and Latin]. Ed. Joannes Benedictus. 4to.  

Olympia, Pythia, Nemea, Isthmia. The title in Weldon is 'Pindarica'. There are over twenty 16th and 17th century eds.

Olympia, Pythia, Nemea, Isthmia. Caeterorum octo lyricorum carmina [Greek and Latin]. Ed. Henri Estienne. 12mo. 5th ed. Weldon adds 'P. Steph.', i.e. Paulus Stephanus or Paul Estienne, the publisher. BnF gives Geneva as the place of publication.

Olympia, Pythia, Nemea, Isthmia. Caeterorum octo lyricorum carmina [Greek and Latin]. Ed. Henri Estienne. 16mo. 4th ed. Copac gives [Geneva] as the place of publication. Weldon has ‘excusa per Paulum Stephanum’.

Olympia, Pythia, Nemea, Isthmia. Caeterorum octo lyricorum carmina [Greek and Latin]. Ed. Henri Estienne. 24mo. 4th ed.  

Olympia, Pythia, Nemea, Isthmia. Cæterorum octo lyricorum carmina [Greek and Latin]. Ed. Henri Estienne. 2nd ed. USTC suggests Geneva as the place of publication.

Omnes epistolas ad familiares. Ed. Alexander Scot. 16mo. Two copies. Tome 6 of the seven-volume (8 tomes) Lyon ed. of 1608-1610.

Omnia divini Platonis opera. fol.  

Omnia opera. fol.  

Omnia quae extant opera [Greek and Latin]. Ed. Sigmund Gelen et al. fol. In Weldon under Philo Judaeus.

Omnium operum Divi Eusebii Hieronymi Stridonensis tomus 8. fol. Apparently bound up with an ed. of 'Commentarios in psalterium habet: accessit his psalterium triplice linguae Hebraica, Graeca et Latina'. The date and place of publication, Basel 1516, are provided by USTC.

Onomasticon latino-graecum in usum gymnasiorum Societatis Iesu concinnatum. Not traced. BnF, CCFr and Worldcat list 9 Paris eds between 1627 and 1644.

Onomasticon latino-graecum, in usum gymnasiorum concinnatum. 12mo.  

Opera ... accedunt Novatiani tractatus de trinitate. Ed. Nicolaus Rigaltius & Philippe le Prieur. fol.  

Opera ... cum notis Frontonis Ducaei [Greek and Latin]. fol. 11 vols. Eleven vols of the twelve-volume ed. Weldon mentions that one vol. contains the commentary of Andreas Caesariensis, bishop of Cappadocia, on the Apocalypse. There are several 16th-century eds of this text.

Opera ... ad usum Delphini. Ed. Charles de la Rue. 4to. 2nd ed.  

Opera ... adversus omnes haereses. fol.  

Opera ... cum scholiis S. Maximi et paraphrasi Pachymerae a Balthasare Corderio [Greek and Latin]. fol. 2 vols.  

Opera ... cum utriusque autoris vita & Ulpenni commentariis [Greek and Latin]. Ed. Hieronymus Wolf. fol. By Demosthenes and Aeschines.

Opera ... de naturalium effectuum admirandorum causis. Ed. Guilielmus Gratarolus. 8vo. Weldon copy in Toulouse Univ. Library. Listed in Books in Hell.

Opera ... edita... Jac. Billius Prunaeus [Greek and Latin]. fol. Apparently vol. 1 of the two-volume ed. of 1609-1611.

Opera ... in quibus theologiae mysteria plurima ... revelantur. fol. Three tomes in one vol.

Opera ... omnia [Greek and Latin]. Ed. Denis Petau et al. 4to.  

Opera ... omnia [Greek]. Ed. Desiderius Erasmus. fol.  

Opera ... studio monachorum ordinis S. Benedicti e congregatione S. Mauri. [Tomus] VI et VII. fol. 2 vols.  

Opera ... tractatus juris regaliorum ... de mandatis apostolicis. 4to.  

Opera a Josepho Scaligero et Elia Vineto recognita. USTC suggests Geneva as the place of publication.

Opera cum annotationibus diversorum. Not traced. Copac and BnF list nine Amsterdam eds between 1621 and 1671.

Opera cum annotationibus diversorum. 16mo. Weldon does not give a title.

Opera cum commentariis Servii. 4to. Edited by Maurus Honoratus Servius.

Opera cura et studio Ant. de Winghe. 4to. Weldon copy at Douai Abbey.

Opera digesta in 2 tomos, secundum ordinem temporum, nunc primum disposita. 4to.  

Opera Dionysii Areopagitae cum epistolis Ignatii Antiocheni. fol. The third author is Polycarpus. Bound up with a work by Raymundus de Sabunde.

Opera et alia quotquot extant, cum argumentis scholiis et observationibus. Ed. Niccolo Eritreo. 8vo.  

Opera ex editione romana. fol. 2 vols. Five tomes in two vols.

Opera graece et latine; cura et studio Joan. Auberti. fol. 7 vols.  

Opera Jac. Billius... emendavit [Greek and Latin]. fol. This is vol. 2 of a two-volume ed.

Opera Joannes Savaro recognovit et librum commentarium adjecit. 4to.  

Opera omnia ... Accessit Ioannis Zonarae expositio canonicarum epistolarum [Greek and Latin]. fol. The other authors, also mentioned by Weldon, are Macarius of Egypt and Basilius of Seleucia. Weldon copy in Toulouse Univ. Library.

Opera omnia ... castigata per Margarinum de la Bigne. fol.  

Opera omnia ... cura et studio unius e S. Mauri congregatione monachi benedictini. 4to. Renatus Ambrosius Janvier and Jean Mabillon were involved in the editing process.

Opera omnia in duos tomos distributa ... Dionysius Petavius ... recensuit [Greek and Latin]. fol. 2 vols.