{"value"=>"<p>The final series consists of two undated sketchbooks containing sketches and floorplans of pueblos, presumably made during his U.S.G.S. field work; four notebooks containing lists of photographs taken for the Detroit Publishing Company (1903, 1904, 1906); undated notes on art history; notes (1929 and undated) on the history of the American West, made in the course of his work for the Oregon Trail Memorial Association; and a few pieces of ephemera that had been tucked into the diaries, including a roster of Company K of the 12th Vermont Regiment, a military pass issued to Jackson (1863), a map of the Trans-Siberian Railroad, and a death notice of his second wife, Emilie Painter Jackson (1918).</p>"}