Standard methods for the examination of water and wastewater  [computer file] / 
prepared and published jointly by American Public Health Association, American Water Works Association [and] Water Environment Federation 
 - 20th ed. 
 - Washington DC :  American Public Health Association,  1999 
 - 1 computer laser optical disc (CD-ROM) :  sd., col. ;  12 cm. +  1 user guide 
<br/><br/><br/>System requirements: Windows 95, 98, NT 3.51 or later, VGA or higher-resolution (800X600 in 16 Bit High Color recommended), 486 processor (Pentium recommended), 12 MB RAM for Win 95, 16 MB RAM for Win 98 and NT 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Analysis<br/>Sewage--Analysis