Dennis R. Helsel
USGS, Denver, CO
Activity
2007
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INVASIVE DATA: HOW SUBSTITUTING VALUES FOR LOW-LEVEL TRACE ELEMENT DATA CAN RUIN RESULTS
T63 Sources, Transport, Fate, and Toxicology of Trace Elements in the Environment IIMonday, 29 October 20078:00 AM - 12:00 PM
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SOIL GEOCHEMISTRY OF THE DENVER METROPOLITAN AREA: MAPPING CHANGE FROM 1972 TO 2005
T6 Denver Then and Now: From Paleontology to Public Policy on the Front Range Urban CorridorSunday, 28 October 20078:00 AM - 12:00 PM
2004
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STATISTICAL ANALYSIS OF NONDETECTS IN BIOGEOCHEMICAL DATA
T170 Current Perspectives in Environmental Biogeochemistry IITuesday, 9 November 20041:30 PM - 5:30 PM
2003
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A PROPOSED CONTINENTAL-SCALE SOIL GEOCHEMICAL SURVEY OF NORTH AMERICA: ESTABLISHING A DATABASE FOR THE 21ST CENTURY
T50 Soils and a Sustainable Future—The Neglected Challenge in Geology: A Tribute to the Many Contributions and Challenges of Aldo LeopoldSunday, 2 November 20031:00 PM - 3:45 PM