Shallow ground water
 E. Nissen-Petersen, Kenya
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Shallow ground water
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 E. Nissen-Petersen, Kenya
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 E. Nissen-Petersen, Kenya
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Dowsing tool
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 E. Nissen-Petersen, Kenya
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 E. Nissen-Petersen, Kenya
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 E. Nissen-Petersen, Kenya
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 E. Nissen-Petersen, Kenya
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Waterholes in riverbeds
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 E. Nissen-Petersen, Kenya
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Waterholes in riverbeds
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 E. Nissen-Petersen, Kenya
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Probing using probing rods hammered into the sand
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 E. Nissen-Petersen, Kenya
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Trial pits
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 E. Nissen-Petersen, Kenya
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Sand test
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 E. Nissen-Petersen, Kenya
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Plan of the Mwiwe riverbed
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 E. Nissen-Petersen, Kenya
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Longitudinal profile of Mwiwe riverbed
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 E. Nissen-Petersen, Kenya
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A direct action pump
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 E. Nissen-Petersen, Kenya
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A non-functioning India Mark II pump replaced with a windlass made of Sisal poles
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 E. Nissen-Petersen, Kenya
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A pump with a cylinder head of concrete
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 E. Nissen-Petersen, Kenya
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Hand pumps for deep wells and boreholes
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