Crystallography Organizations in the Yahoo! Directory

International Union of Crystallography
www.iucr.ac.uk
European Crystallographic Association
www.ecanews.org
The British Crystallographic Association (The BCA)
Registered charity to advance the education of the public in the science of crystallography, particularly within the British Isles.
bca.cryst.bbk.ac.uk/bca/welcome.htm
American Crystallographic Association
www.hwi.buffalo.edu/ACA
US National Committee for Crystallography
www.sdsc.edu/Xtal/USNCCr/USNCCr.html
International Workgroup on Mathematical and Theoretical Crystallography (MaThCryst)
Dedicated to the fundamentals of the field and trying to bridge the gap that now existing between the "user" and the "specialist."
www.lcm3b.uhp-nancy.fr/mathcryst