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Links:
GEM-300: http://www.geoafrica.co.za/reddog/GSSI/
Other EM instruments: www.geonics.com
Aqua Probe: www.aquapro-sensors.com
TDR: www.campbellsci.com
OSU hillslope and watershed group: http://www.cof.orst.edu/cof/fe/watershd/
Beautiful pictures: www.ececs.uc.edu/~ssohoni/scenes/mtns.html