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| p | pa | pb | pc | pd | pe | pf | pg | ph | pi | pj | pk | pl | pm | pn | po | pp | pq | pr | ps | pt | pu | pv | pw | px | py | pz |
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| peat soil Portable soil EC-mapper Portative and economical device for mapping soils based on electrical conductivity or resistivity measurements usable in soil surveying, arheology, forensic and precision agriculture http://www.landviser.com/prod01.htm |
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