31 great circles of the spherical icosahedron (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "31 great circles of the spherical icosahedron" in English language version.

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1rwgrayprojects.com

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rwgrayprojects.com

"Fig. 457.40 Definition of Spherical Polyhedra in 31-Great-Circle Icosahedron System" (PDF). rwgrayprojects.