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[3]
CLAYTON SG, 1971, LANCET, V2, P1197
[4]
KARMAN H, 1970, OCT INT PLANN PAR FE
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KEITH S, 1971, HEALTH TRENDS, V3, P52
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PENFIELD AJ, 1971, NEW YORK STATE J MED, V71, P1185
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[10]
1971, STATE PUBLIC HEALTH