POWDER DIFFRACTION

The Commission on Powder Diffraction (CPD)

http://www.iucr.org/iucr-top/comm/cpd/

The International Centre for Diffraction Data (ICDD)

http://www.icdd.com

The International X-ray Analysis Society (IXAS)

http://www.ixas.org

CCP 14

http://www.ccp14.ac.uk