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<br />. <br />. .. <br /> <br />t <br /> <br />EPA.670/4.73.001 <br />July 1973 <br /> <br />BIOLOGICAL FIELD AND LABORATORY METHODS <br />FOR MEASURING THE QUALITY OF SURFACE WATERS AND EFFLUENTS <br /> <br />Edited by <br />Cornelius I. Weber, Ph.D. <br />Chief, Bio logical Methods <br />Analytical Quality Control Laboratory <br />National Environmental Research Center-Cincinnati <br /> <br />~ <br /> <br />Program Element lBA027 <br /> <br />NATIONAL ENVIRONMENTAl RESEARCH CENTER <br />OFFICE OF RESEARCH AND DEVElOPMENT <br />U.S. ENVIRONMENTAL PROTECTION AGENCY <br />CINCINNATI, OHIO 45268 <br /> <br />- <br />