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. 1963 Apr;35(5):390–401.
Chalcedony and Childbirth: Precious and Semi-Precious Stones as Obstetrical Amulets **
Part of this investigation was conducted during tenure of research grants G-8673 and G-17597 from the National Science Foundation, grant RG-6470 from the Division of General Medical Sciences, U.S. Public Health Service, and a grant from the Wellcome Trust.