Recto-verso drawing
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A recto-verso drawing or "recto and verso drawing" is a drawing on both sides of a sheet of paper, either when so planned and intended, or when so understood when two drawings were made on either side of the paper in a sketchbook or the like, and the page was then removed.
A 2001 exhibit at Fogg Art Museum at Harvard University displayed such drawings from the Renaissance to what was then the present.