Richard P PohanishRichard P. Pohanish is the author or co-author of more than twenty books in the environmental health, safety, chemistry, and engineering fields. Active in the information and publishing business for almost half a century, Mr Pohanish is president andpublisher of Chem-Data Systems and author of Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens. Read More Read Less