00353nam a22001097a 4500008004100000040005500041100001900096245005300115260005200168300001000220650001300230230419b        |||||||| |||| 00| 0 eng d  aNational Science LibrarycNational Science Library  aBick, Hartmut   aCiliated protozoa c/ World Health Organization,  aGeneva:  bWorld Health Organization,    c1972  a198p.  2Science