1. Quality-assurance data for routine water analysis in the laboratories of the U.S. Geological Survey for water year 1990 Author/Creator: Maloney, Thomas J., author Publication/Creation: Denver, Colorado : U.S. Geological Survey, 1993 Resource Type: Book Access & Availability: Loading
2. Quality-assurance results for routine water analyses in U.S. Geological Survey laboratories, water year 1998 Author/Creator: Ludtke, Amy S., author Publication/Creation: Denver, Colorado : U.S. Geological Survey, 2000 Resource Type: Book Access & Availability: Loading