Color characterization before and after lime treatment / H. S. Dugal...[et. al.] - Washington, D.C. : United States Environmental Protection Agency, 1974 - xiii, 174 p. : ill. ; 28 cm. - Environmental Protection Technology Series . EPA-660/2-74-029 April 1974 Subjects--Topical Terms: LimeCalcite Dewey Class. No.: 553.68