Dirk Moerbeek's sketchbooks are loaded with field sketches of birds. Of course, he will not tear them out. Instead, to make them available for buyers, some of the field sketches are reproduced on framed canvas. It is a low-budget print, with an unlimited edition, printed signature and a quality that is somewhat less than the museum quality of Dirk's giclees, but still very nice.
You'll find examples under menuoption Gallery.