The earlier prints, therefore, were of better quality than the later ones.

That so many of these early prints are on display at Yale is a rare treat.

The plate and the image are used repeatedly so that the ghost of the earlier prints remain on the later ones.

Some of the early prints were given additional colour by the artist and his friends.

The tracks of the two riders cross his own earlier prints out to the stable.

It also contains about a third of the surviving early prints, known as Incunables.

These were published with the same standards as the earlier prints and in limited numbers.

The exhibition displays a handful of Adams's early prints, but mostly later ones, from the 1950s and '60s.

An early print (c. 1788) shows the building with a large door in the north side, and cart wheels can be seen within.

Its fame reflects just how much the value of rare, early prints has increased.