Nickel.
Card's contents:
HERTEL R.F. [red.] 548,738 NICKEL Nickel / [IPCS International Programme on Chemical Safety] ; publ. under the joint sponsorship of the United Nations Environment Programme [et al.] ; First draft prep, by R.F. Hertel, T. Maass and F.R. Muller. - Geneva : World Health Organization, 1991. - 383 s. : wykr. : 21 cm (Enviromental Health Criteria ISSN 0250-863X ; 108) Res., res. ISBN 92-4-157108-X
