The atlas contained virtually no maps from the hand of Ortelius, but 53 bundled maps of other masters, with the source as indicated. Previously, groupings of disparate maps were only released as custom lots, to individual order. In the Ortelius atlas, however, the maps were all in the same style and of the same size, printed from copper plates, logically arranged by continent, region and state. In addition to the maps he provided a descriptive comment and referrals on the reverse. This was the first time that the entirety of Western European knowledge of the world was brought together in one book.