Guidebook on the geology,history,and surface-water contamination and remediation in the area from Denver to Idaho Springs,Colorado / Ed.: K. C. Stewart, R. C. Severson, 1994. - III,55 p. p. - Текст : непосредственный.
Proceedings of the 1990 Billings land reclamation symposium on selenium in arid and semiarid environments,western United States,Mar.25-30,1990 / ed. R. C. Severson, 1991. - 146 p.