Hermann–Mauguin notation - Wikipedia
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Hermann–Mauguin notation - Alchetron, the free social encyclopedia
File:Labeled Triangle Reflections.svg - Wikipedia
Donald B Peck - Hermann-Mauguin Symmetry Symbols
History of mathematical notation - Wikipedia
Graphite - Wikipedia
2 - Wiktionary, the free dictionary
Hermann–Mauguin notation, Geology Wiki
Hermann -mauguin symbol
Relationship between Hermann-Mauguin and Schoenflies notation