Model books were the
medieval equivalent to modern clipart. This model book was the
one used when painting one of the few surviving Gutenberg bibles
printed on parchment.
Gutenberg
Digital is a fantastic website where you can view both the
entire model book as well as the bible separately or compare
them side by side. The site also contains the translation of
the model book which details how to paint all of the elements
used for the bible.
Or you can check out the Library book and read it at your leisure.