Two corrections to recent censuses of the Gutenberg 42-line bible

In this note we address two mistakes contained in two important censuses of the extant copies of the Gutenberg 42-line bible. The mistakes have to do with the so-called "increase of edition'' that took place when the printing work had already started, entailing that a number of pages had to be composed twice, producing clearly different outputs. In summary, the mistakes involve the copies known as V2 and P24, today in the Huntington and the Widener Libraries, respectively, and amount to a misclassification of some pages concerning the composition setting to which they belong.