Barbara Cohrssen

• Patty's industrial hygiene
• Patty's Industrial Hygiene, Program Management and Specialty Areas of Practice
• Patty's Industrial Hygiene
• Patty's Industrial Hygiene, Hazard Recognition
• Patty's toxicology
• Patty's Toxicology
• Patty's toxicology
• Patty's Toxicology
• Patty's Toxicology Vols. 4-7, Set
• Patty's Industrial Hygiene and Toxicology
• Patty's Industrial Hygiene and Toxicology
• Patty's Industrial Hygiene and Toxicology