Snell, Foster Dee. Colorimetric methods of analysis : including some turbidimetric and nephelometric methods / Foster Dee Snell and Cornelia T. Snell. - 3rd ed. - New York : D. Van Nostrand, c 1956. - Vols. : ill. ; 24 cm. Includes index. V. 1- (Theory-instruments-PH) ; 333 333 Subjects--Topical Terms: Colorimetric analysis. Dewey Class. No.: 545.8 / S27c