Colorimetric methods of analysis : by Foster Dee Snell and Cornelia T. Snell. including some turbidimetric and nephelometric methods : Vol. - IV / Colorimetric analysis Snell, Foster Dee, 1898- Snell, Cornelia T. (Cornelia Tyler), 1896- joint author. Colorimetric analysis. QD113 .S62 545.812 SNC Supplementary vols. by Foster D. Snell and Cornelia T. Snell assisted by Chester Arthur Snell, have subtitle: Including photometric methods. First ed. published in 1921 under title: Colorimetric analysis. Bibliographic footnotes. New York : D. Van Nostrand Co., c1954. c1954. 1948 Text vii, 676 p. : eng