West Thumb. The water level in many of the pools of the West Thumb Geyser Basin appears to have dropped since Jackson first photographed them in August 1871. September 2012;

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Keywords: 276, america, american, basin, conservation, contemporary, country, geyser, grant, henry, historic, historical, history, jackson, lake, land, lands, national, natural, nature, np, park, parks, photography, preserve, public, service, thermal, thumb, usa, village, west, whj, widlife, wilderness, william, wyoming, yellowstone