...On the otherhand, in the opus incertum, the rubble, lying in courses and imbricated,makes a wall which, though not beautiful, is stronger than thereticulatum... 
Vitruvius 「Ten Books on Architecture」
...In capitellis veteribus opus erat planum, in novissculptura subtilis...
Matthew Holbeche Bloxam 「The Principles of Gothic Ecclesiastical Architecture, Elucidated by Question and Answer, 4th ed.」
...A 'novum opus,' a term applied to some specialbuilding, was also in progress...
Hubert C. Corlette 「Bell's Cathedrals: Chichester (1901)」
...
"Ut enim pictores, et qui signa faciunt, et vero etiam poetæ suumquisque opus à vulgo considerari vult, ut si quid reprehensum sit àpluribus id corrigatur ...
Luigi Antonio Lanzi Thomas Roscoe 「The History of Painting in Italy, Vol. 1 (of 6)」
...It is inscribed, Opus Leonardi Pistoriens...
Luigi Antonio Lanzi Thomas Roscoe 「The History of Painting in Italy, Vol. 1 (of 6)」
...Many histories of the saint are there to be found, divided intopictures, in the early style, and inscribed, Allegrettus Nutii deFabriano hoc opus fecit 136...
Luigi Antonio Lanzi Thomas Roscoe 「The History of Painting in Italy, Vol. 2 (of 6)」
...The title of the work is Opus Chronologicum...
George Chambers 「The Story of Eclipses」
...Bacon, Roger: Opus Tertium, vol...
Dorothy Stimson 「The gradual acceptance of the Copernican theory of the universe」
... Roger Bacon: Opus Tertium, 295, 30-31...
Dorothy Stimson 「The gradual acceptance of the Copernican theory of the universe」
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