National Geographic : 1937 Mar
c) Photograph from Lehnert SAHARA S SWELLING DUNES BILLOW ON THE SOUTHERN FRONTIER OF TUNISIA Camels and gowned Moslems perch on the ocean of sand amid long shadows at dusk. Rippled by the wind andstamped with men's and camels' footprints, dunes prevent the extension of good roads to the south. In the north of Tunisia are fertile valleys planted to wheat andbarley, hills thickly wooded with cork oaks, and groves of oranges and lemons. Olive trees turn the east coast silver gray. Palms fringe the southern marches, pastures cover the high tablelands, and nomads move back and forth to the dictates of drought and plenty.