Darger constructed massively thick scrapbooks of clipped daily comics. For Ashbery's main uses of comics, see the Popeye sestina "Farm Implements and Rutabagas in a Landscape" (The Double Dream of Spring, 1970) and "Daffy Duck in Hollywood" (Houseboat Days, 1977). Ashbery's most famous use of found material involves William Le Queux's Beryl of the Biplane (1917), the book that furnishes much of the content of "Europe" (The Tennis Court Oath, 1962). Beryl, an aviatrix who shoots down zeppelins and saves military secrets, now looks like a grown-up version of a plucky, resourceful Vivian Girl. Like Darger, Ashbery has drawn upon children's books: Three Hundred Things a Bright Boy Can Do (by "Many Hands," 1911) provides material for "The Skaters" (Rivers and Mountains, 1966). John Shoptaw notes that after "Europe" Ashbery made a poem from Franklin W. Dixon's Hardy Boys novel The Secret of the Old Mill (359).