Thon, William (American, 1906-2000) UNTITLED SKETCHBOOK DRAWING #16. Ink on paper, not dated, but circa 1960s. Unsigned.The sketchbook identified by an Estate label on its cover. 5 x 8 sheet from a spiral-bound book, preserving the holed edge.In excellent condition. Matted to 7 1/4 x 10 1/4 inches; framed to 8 3/4 x 11 3/4 inches.