. . "PaĆ­ses subdesarrollados" . . . . . "Measurement of infant mortality in less developed countries" . . . . . . . . "Vital statistics"@en . "Vital statistics" . . . "Measurement of infant mortality in less developed countries"@en . "Measurement of infant mortality in less developed countries" . . . . "United States. Bureau of the Census." . . "United States Bureau of the Census" . "Developing countries" . .