Geologic Atlas of the US: Niagara Folio, New York, 1913. Large paper back folio, 21.75"x 18.5" comprising 24pp of text with figures, 3 maps on the Niagara Quadrangle, 1:125,000 scale and at the folio's dimensions: Topographic; Areal Geology (solid); Superficial Geology; a 4^th fold out Areal Geology at 1:12,000, 49"x21.75" - see image. 3pp of photographs of the Falls, the Gorge and various quarry exposures. On the inside of the front and back covers there is a general introduction to geology and the folio series. The covers and text pages are browned with age. There are marked water stains to the right margin of the front cover and the first five text pages (not affecting text) and slight watermarks to the remaining text and first three maps, again right margin only and not affecting text or drawings. This folio text is in fair to good condition, the maps are in good to very good condition. The photographs are in very good condition. Weighs 2lbs / 900gm in fat mailing tube.