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Published online by Cambridge University Press: 10 January 2013
Use of the program NBS*AIDS83 to modify data in the ICDD Powder Diffraction File (PDF) has led to substantial changes in card entries for Sets 1-33, in contrast to the previous policy of the International Centre for Diffraction Data of republishing cards where data has been significantly altered. Further changes to data have been revealed in the use of the database with the Philips PLUS 37 search and retrieval system.