RT Journal Article SR Electronic T1 Occupational respiratory diseases in British Columbia, Canada in 1991. JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 710 OP 712 DO 10.1136/oem.51.10.710 VO 51 IS 10 A1 G R Contreras A1 R Rousseau A1 M Chan-Yeung YR 1994 UL http://oem.bmj.com/content/51/10/710.abstract AB