00398nam a2200121Ia 450000500170000000800410001702000150005805000210007310000150009424501100010926000410021965000160026020251229182809.0251229s9999    xx            000 0 und d  a0821321013  aSPEC TJ 912 .B37  aBarlow, R. 0aSolar pumpingb An introduction and update on the technology, performance, costs and economics cR Barlow  aWashington DCb The world Bankc1993  aSolar Pumps