Chemical analysis of ecological materials / by Stewart E. Allen ... [et al.] ; edited by Stewart E. Allen. Allen, Stewart E., ed. Chemistry, Analytic. Soils Analysis. Plants Analysis. Water Analysis. QD131 .C4 1974b 581.6 ALC Includes index. Bibliography: p. 533-555. Oxford : Blackwell Scientific, 1974. 1974. 1974 Text x, 565 p., leaf of plate, [2] fold. p. of plates : eng