Swaine, D. J. The Trace-element content of soils / by D. J. Swaine. - England : Commonwealth Agricultural Bureaux, 1969. - viii, 157 p. : ill. ; 25 cm. - Common wealth Bureau of soil science technical communication ; no . 48 . Includes bibliographical references (P.132-157). Subjects--Topical Terms: Soils -- Trace element content. Dewey Class. No.: 631.41