Karl J. Ellefsen

Geochemical and mineralogical maps for soils of the conterminous United States

David B. Smith, William F. Cannon, Laurel G. Woodruff et al. · Antarctica A Keystone in a Changing World · 2014 · 217 citations

Engineering, Trace Element Geochemistry, Soil Mineralogy +17

Chromium(VI) generation in vadose zone soils and alluvial sediments of the southwestern Sacramento Valley, California: A potential source of geogenic Cr(VI) to groundwater

Christopher T. Mills, Jean M. Morrison, Martin B. Goldhaber et al. · Applied Geochemistry · 2011 · 107 citations

Hydrogeology, Environmental Chemistry, Biogeochemistry +11

Geochemical and mineralogical maps, with interpretation, for soils of the conterminous United States

David B. Smith, Federico Solano, Laurel G. Woodruff et al. · Scientific investigations report · 2019 · 64 citations

Soil Pedology, Engineering, Trace Element Geochemistry +14

Elastic wave propagation along a borehole in an anisotropic medium

Karl J. Ellefsen · 1990 · 42 citations

Applied Geophysics, Engineering, Seismic Wave +21

An Introduction to Using Surface Geophysics to Characterize Sand and Gravel Deposits

Jeffrey E. Lucius, William H. Langer, Karl J. Ellefsen · U.S. Geological Survey circular/U.S. Geological Survey Circular · 2007 · 41 citations

Ore Exploration, Engineering, Geomorphology +21