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In 1923, America paid close attention, via special radio broadcasts, newspaper headlines, and cover stories in popular magazines, as a government party descended the Colorado to survey Grand Canyon. Fifty years after John Wesley Powell's journey, the canyon still had an aura of mystery and extreme danger. At one point, the party was thought lost in a flood. Something important besides adventure was going on. Led by Claude Birdseye and including colorful characters such as early river-runner Emery Kolb, popular writer Lewis Freeman, and hydraulic engineer Eugene La Rue, the exped

Colorado River (Colo.-Mexico) - Description and travel. --- Colorado River (Colo.-Mexico) -- Description and travel. --- Colorado River (Colo.-Mexico) - Environmental conditions. --- Colorado River (Colo.-Mexico) -- Environmental conditions. --- Dams - Colorado River (Colo.-Mexico) - History - 20th century. --- Dams -- Colorado River (Colo.-Mexico) -- History -- 20th century. --- Geological Survey (U.S.). --- Geological Survey (U.S.) -- Biography. --- Geological Survey (U.S.) -- History -- 20th century. --- Grand Canyon (Ariz.) - Description and travel. --- Grand Canyon (Ariz.) - Environmental conditions. --- Grand Canyon (Ariz.) -- Environmental conditions. --- River surveys - Colorado River (Colo.-Mexico) - History - 20th century. --- River surveys -- Colorado River (Colo.-Mexico) -- History -- 20th century. --- Water resources development - Arizona - Grand Canyon - History - 20th century. --- Water resources development -- Arizona -- Grand Canyon -- History -- 20th century. --- Water-supply - Political aspects - Arizona - Grand Canyon - History - 20th century. --- Water-supply -- Political aspects -- Arizona -- Grand Canyon -- History -- 20th century. --- River surveys --- Dams --- Water-supply --- Water resources development --- Regions & Countries - Americas --- History & Archaeology --- United States Local History --- History --- Political aspects --- Geological Survey (U.S.) --- Grand Canyon (Ariz.) --- Colorado River (Colo.-Mexico) --- Description and travel. --- Environmental conditions. --- Availability, Water --- Water availability --- Water resources --- River surveying --- Rivers --- Surveying --- U.S.G.S. --- U.S. Geological Survey --- United States. --- Servicio Geológico de los Estados Unidos --- United States Geological Survey --- USGS --- Energy development --- Natural resources --- Public utilities --- Water utilities --- Diversion structures (Hydraulic engineering) --- Earthwork --- Hydraulic structures --- River engineering --- Barrages --- Surveys --- Geographical and Geological Survey of the Rocky Mountain Region (U.S.) --- Geographical Surveys West of the 100th Meridian (U.S.) --- Geological and Geographical Survey of the Territories (U.S.)

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Presenting the first book to focus on the importance of silicon for plant health and soil productivity and on our current understanding of this element as it relates to agriculture.Long considered by plant physiologists as a non-essential element, or plant nutrient, silicon was the center of attention at the first international conference on Silicon in Agriculture, held in Florida in 1999. Ninety scientists, growers, and producers of silicon fertilizer from 19 countries pondered a paradox in plant biology and crop science. They considered the element Si, second only to o

Soils --- Botanical chemistry --- Soil fertility --- Silicon --- Silicon content --- Bioavailability --- Silicon in agriculture. --- Agriculture --- Silicon in agriculture

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Water-supply --- Water quality management