00442nam a2200157Ia 4500008004100000082001800041100001300059245005700072260002200129300000800151650003800159650003400197653002100231700001400252700001800266170901s1968    xx            000 0 und d  a628.352bB38P  aBear, J. 0aPhysical Principles of Water Percolation and Seepage  aUSAbUNESCOc1968  a464  aEngineering and allied operations  aTechnology (Applied sciences)  aWater filtration  aIrmay, S.  aZaslavsky, D.