The British Library has put the The Gutenberg Bible online digital facsimile. If you\'ve never seen the real thing, check this virtual copy out. They say there are only 48 left and The British Library has two complete copies. They discovered 3 interesting things while producing The digital images.
1.It was first envisaged that rubrics should be printed in red. This was soon abandoned, perhaps to save time.
2.It was decided to increase the number of lines per page, presumably to save paper.
3.It was decided to increase the print-run, but as some sheets had already been printed in the number first envisaged, these pages had to be printed again. This is the best explanation for why a number of the pages exist in two different versions.