00319nam a2200121Ia 450000500170000000800410001702000140005808200130007210000210008524500350010625000110014126000450015220250107154848.0241216s9999||||xx |||||||||||||| ||und||  a700190895  a614.7EHL  aVictor M. Ehlers 0aMunicipal and rural sanitation  a6th ed  aNew yorkbMcGraw-Hill Book companyc1965