2.
Improving Well and Pump Efficiency
by Otto J. Helweg, Verne H. Sc...
ISBN: 9780898672848
List Price: $45.00
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Microcomputer Applications in Water Resources
by Helweg, Otto J.
ISBN: 9780135824795
List Price: $93.00
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Water Resources: Planning and Management - Otto J. Helweg - Hardcover
by Helweg, Otto J.
ISBN: 9780471047704
List Price: $63.95
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Recursos Hidraulicos - Planeacion y Administracion (Spanish Edition)
by Otto J. Helweg
ISBN: 9789681842239
List Price: $60.00