| http://www.w3.org/ns/prov#value | - Right after the discovery of Friedrich et al. (1912), scientists X-rayed all kinds of materials; not only crystals, but also fibrous, lamellar and granular substances, glasses, polycrystalline metals, rolled zinc, beeswax - almost anything, even if it seemed hopeless at the time to interpret some of the diffraction pictures.
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