1. Anonymous: Nitrate and nitrite in water and seawater. Industrial Method No. 158-71W, 3 pp. Tarrytown, N.Y.: Technicon Industrial Systems 1972
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3. Anonymous: Orthophosphate in water and seawater. Industrial Method No. 155-71W, 3 pp. Tarrytown, N.Y.: Technicon Industrial Systems 1973b
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