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https://doi.org/10.1057/9780230111813the elements, for instance, crystallize in one or more of three simple structures, namely face-centred cubic (fcc, or cubic close-packed), body-centred cubic (bcc) or hexagonal close-packed (hcp). Two of these were suggested by W. Barlow in a remarkable paper of 1883, 30 years before W. L. Bragg pub