All I know about the so-called "gas chambers" comes from what I have read. I never believe anything simply because it agrees with me, others believe it, or that I am intimidated by the credentials of those who write. I reason things out and to this point the jew's version, that is, the only version taught in schools, stands on very weak legs since most of the stories violate known laws of chemistry and physics. I suggest that you visit the following web sites for the information which changed me from a believer to a non-believer. Also, there are scores of books dealing with this topic which are available on some of the sites. All have valuable links to other sites.
http://pubweb.acns.nwu.edu/~abutz/

http://www.ihr.org

http://www.air-photo.com

http://www.cwporter.com

http://www.abbc.com/aaargh

http://www.zundelsite.org

http://www.fpp.co.uk

http://www.stormfront.org

http://kevin-strom.com

http://www.natvan.com