American Vacuum Society (Popularity: )
http://www.avs.org/ Includes descriptions of the society's aims, online access to publications, administrative information, related news and information on conferences.
Mc Nally Institute (Popularity: )
http://www.mcnallyinstitute.com An excellent resource with enormous amount of information for advanced vacuum users about pumps and seals (troubleshooting, specifications etc.)
Oxford Vacuum Science (Popularity: )
http://www.oxford-vacuum.com Oxford Vacuum Science Ltd promotes good vacuum practice and understanding through the provision of training, design and consultancy services, and ...