Briefing images issued by INS Department of Propaganda, November 2004

Aerial photos in the study of physiographic processes: Old-age dune topography, now under cultivation; large areal blowout, with transverse dune ridges up to 12 ft. high, developed through rejuvenation of an old sand-hill topography by improper land use. The wind direction is from right to left; stereogram showing tortuous character of a multi-cycle dune complex. Some blowouts are still active others are in youth of the eluvial phase. (H. T. U. Smith, Aerial Photographs and their Applications, London: D. Appleton-Century, 1943, pl. 62)