1. Precision and bias of selected analytes reported by the National Atmospheric Deposition Program and National Trends Network : 1983 and January 1980 through September 1984 Author/Creator: Schroder, L. J., author Publication/Creation: Lakewood, Colorado : U.S. Geological Survey, 1985 Resource Type: Book Access & Availability: Loading
2. Programs and analytical methods for the U.S. Geological Survey acid rain quality-assurance project Author/Creator: See, Randolph B., author Publication/Creation: Denver, Colorado : U.S. Geological Survey, 1990 Resource Type: Book Access & Availability: Loading