1. An interagency partnership applied to the study of environmental health in the Lower Rio Grande Valley of Texas;Akland;Environment International,1997
2. 2540C. Total dissolved solids dried at 180°C;American Public Health Association,1998
3. 9222 B. Standard total coliform membrane filter procedure. 9222 D. Fecal coliform membrane filter procedure;American Public Health Association,1998
4. 3111. Metals by flame atomic absorption spectrometry;American Public Health Association,1998
5. 3500-Fe B. Phenanthroline method;American Public Health Association,1998