American Crystallographic Association (ACA) A non-profit, scientific organization of over 1,200 members in more than 40 countries dedicated to the advancement of crystallography.
| American Crystallographic Association (ACA) A scientific society that promotes interactions among scientists who study the structure of matter at atomic resolution.
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Associazione Italiana di Cristallografia (AIC) The Italian Crystallographic Association promotes the study and advancement of crystallographic sciences in Italy.
| British Crystallographic Association (BCA) The British Crystallographic Association is the UK"s national society for crystallography, promoting the subject and its applications.
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