The effects of unusual work schedules and concurrent exposures on occupational exposure limits (OELs). Occupational health and safety bulletin CH055 The effects of unusual work schedules and concurrent exposures on occupational exposure limits (OELs). Occupational health and safety bulletin CH055

• 
• ALBERTA. GOVERNMENT. EMPLOYMENT AND IMMIGRATION; Government of Alberta. Employment and Immigration. Edmonton: Government of Alberta, 2011, https://open.alberta.ca/dataset/1f87a2c7-27a0-4adb-80f4-91d4066d21ed/resource/5a93d35e-2f7c-40b8-bcf9-b231867791f1/download/whs-pub-ch055.pdf