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The conclusion of a ten-year study of water fluoridation:

Ast, David B ; SCHLESINGER, R
En: The challenge of Epidemiology : issues and selected readings / discussed and compiled by Carol Buck. [et al.]. - Washington : Pan American Health Organization, 1988. -- 989 p..  , 1988
Link: http://bibliotecavirtual.ranm.es/ranm/es/consulta/regi..