These engravings are in a combination of line and stipple work, and in the case of three of them (see gallery: "The Old Shepherd", "The Young Shepherd" and The "Astrologer"), there are first states which are purely in line-work. The plates were later reworked in stipple work, in at least one case after a considerable number of impressions of the first state had been taken. The final group of prints are almost entirely in stipple, except for the main outlines. There are also some prints in Campagnola's manner of which the authorship is disputed.