El Golfo Biosphere Reserve, MEX. / Sand patterns and shell studded rock beneath the cliffs of Sonora, Mexico's Upper Gulf & Colorado Delta Biosphere Preserve. 82000V3
El Golfo Biosphere Reserve, MEX. / Fossilized sand dollars beneath the cliffs of Sonora, Mexico's Upper Gulf & Colorado Delta Biosphere Preserve. 82000V7
Biosphere Reserve of the Pinacate & Gran Desierto Altar, Sonora Mexico / Dune patterns of the Gran Desierto. 82000V4
