TY - BOOK ED - United States TI - National water quality handbook: water, life's most essential element PY - 2003///] CY - [Washington, D.C.] PB - U.S. Dept. of Agriculture, Natural Resources Conservation Service KW - Water quality KW - United States KW - Handbooks, manuals, etc KW - Local KW - Water quality management N1 - Cover title; "Issued September 2003 ; 450-VI-NWQH"--P. [2] of cover; Shipping list no.: 2004-0011-S; Includes bibliographical references and index ER -