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'''Greyspace''' is a [[crystal sphere]] containing the [[celestial body|world]] [[Oerth]].<ref name="CoAS">{{Cite_Pub|AD&D Adventures in Space}} ''Concordance of Arcane Space'' . Greyspace sidebar. pp. 78 and 80.</ref><ref name="LotV">{{Cite_Pub|AD&D Adventures in Space}} ''Lorebook of the Void'' . Chapter 4 "Known Spheres". pp. 89-92.</ref><ref name="SJR6">{{Cite_Pub|Greyspace}}</ref>