Duncan Mara text Chichester English Language Book Society and John Wiley Sons 1977 en 399 p.: ill.; 24 cm. Duncan Mara PUBLIC HEALTH -- ENVIRONMENTAL HEALTH -- WATER 614/WAT 240228 20240228103610 INLIS000000000010721 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)