title: What you don't know.
authors.affiliation: raymondwagner@hotmail.com
authors.forename: Raymond
authors.initials: R
authors.lastname: Wagner
mesh_terms: D000062:Accidents, Occupational / Q000517:prevention & control*; D020378:Confined Spaces; D005740:Gases / Q000633:toxicity*; D033161:Government Regulation; D015386:Hazardous Substances / Q000009:adverse effects*; D006801:Humans; D000860:Hypoxia / Q000209:etiology*; D016273:Occupational Exposure / Q000517:prevention & control*; D012449:Safety; D014481:United States; D014489:United States Occupational Safety and Health Administration
chemical_list: D005740:Gases; D015386:Hazardous Substances