Symmetry by L. S. Dent Glasser
= Symmetry by L. S. Dent Glasser
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https://www.iucr.org/what-we-do/education/pamphlets/symmetry
IUCr teaching pamphlet, sections 2–3: crystallographic symmetry operations, crystal classes and symmetry elements in periodic arrays; 32 point groups and 230 space groups.