1. A modification of the U.S. Geological Survey one-sixth order semiquantitative spectrographic method for the analysis of geologic materials that improves limits of determination of some volatile to moderately volatile elements Author/Creator: Detra, D. E., author Publication/Creation: [Reston, Virginia] : Department of the Interior, U.S. Geological Survey, 1988 Resource Type: Book Access & Availability: Loading
2. Quality-assurance data for routine water analysis in the laboratories of the U.S. Geological Survey : 1981 annual report Author/Creator: Peart, Dale B., author Publication/Creation: Denver, Colorado : U.S. Geological Survey, 1983 Resource Type: Book Access & Availability: Loading