http://www.HooperSupply.com/ Hooper Welding Supply, Oklahoma City, OK MSDS's for welding gaseshttp://www.phys.ksu.edu/area/jrm/Safety/msds.html A list of MSDS links provided by Kansas State Universityhttp://www.phys.ksu.edu/area/jrm/Safety/ The Safety Links page of Kansas State University with sources for other MSDS pageshttp://msds.pdc.cornell.edu/ Cornell University MSDS pagehttp://physchem.ox.ac.uk/MSDS/ Oxford University; The Physical and Theoretical Chemistry Laboratory Oxford University Chemical and Other Safety Informationhttp://www.boc.com/gases/msds_us/index_msds_us.cfm BOC gases MSDS fileshttp://www.state.nj.us/health/eoh/rtkweb/rtkhsfs.htm Fact sheets, part of NJ's "Right to Know" program of the N J Department of Health and Senior Seviceshttp://www.state.nj.us/health/eoh/rtkweb/ Homepage N J "Right to Know" NJ Department of Health and Senior Services, Division of Epidemiology, Environmental and Occupational Healthhttp://www.cdc.gov/niosh/npg/npg.html National Institute for Occupational Safety & Health, Pocket Guide to Chemical Hazardshttp://www.cdc.gov/ Centers for Disease Control & Prevention, homepagehttp://hazmat.dot.gov/gydebook.htm DOT Hazmat Guidebook, Emergency Response Data. The Emergency Response Guidebook (ERG2000) was developed jointly by the US Department of Transportation, Transport Canada, and the Secretariat of Communications and Transportation of Mexico (SCT) for use by firefighters, police, and other emergency services personnel who may be the first to arrive at the scene of a transportation incident involving a hazardous material. It is primarily a guide to aid first responders in (1) quickly identifying the specific or generic classification of the material(s) involved in the incident, and (2) protecting themselves and the general public during this initial response phase of the incident. The ERG is updated every three years to accommodate new products and technology.http://hazmat.dot.gov/hazhome.htm Hazmat homepage. Click on the warning sign that covers the topic you are studing or answers the question you may have.