549,835 OCCUPATIONAL Occupational exposure limits for airborne toxic substances : values of selected countries prepared from the ILO-CIS data base of exposure limits. - 3 ed. - Geneva s International Labour Office, 1991. -XIV, 455 s. ]21x30 cm (Occupational Safety and Health Series, ISSN 0079-3129 , no. 37) ISBN 92-0-107293-2