There may be dozens more genuine Rembrandts in the world.

Dutch art historian Ernst van de Wetering has published the sixth and final volume of the Rembrandt Research Project. In it, he re-attributes several paintings that he and a committee had previously determined were not painted by the Dutch master.

Scholars have debated the number of genuine Rembrandts for years. They have ranged from a high of 714 to a low of 300. Van de Wetering now puts the number around 340.

Many paintings in museums are said to be from the “Rembrandt School” if their origin is undetermined. And many scholars are rejecting van de Wetering’s conclusions.

But others are embracing it. A small museum in Omaha Nebraska bought a painting in 1942 that was considered a genuine Rembrandt. But in the late Eighties it was forced to change the attribution to “School of Rembrandt.” Based on van de Wetering’s conclusions, the museum re-attributed it to Rembrandt in May, and has noticed an increase in attendance.