International Union of Crystallography.

The Union was founded in 1947 to advance international cooperation in crystallography; contribute to the advancement of the field in all aspects including non-crystalline states; promote international publication of crystallographic research; facilitate international standardization of methods, units, nomenclature, and symbols used in crystallography; and form a focus for the relations of crystallography to other sciences.

From the description of Records of Paul Peter Ewald, 1936-1967. (Unknown). WorldCat record id: 81313279