The diagnosis of mineral deficiencies in plants by visual symptoms : a colour atlas and guide / Mineral deficiencies in plants. Wallace, T. (Thomas), 1891-1965. Agricultural Research Council (Great Britain) Deficiency diseases in plants. SB742 .W3 1951 581.21 WAD Preface signed: Agricultural Research Council. Corrigenda slip inserted. Includes bibliographies. London : H. M. Stationery Off. ; c1951. c1951. 1951 Text vii, 107 p. : eng