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3
Designing Difference in Difference Studies With Staggered T..
NBER working paper series, no. w31842
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4
The Impact of Lead Exposure on Fertility, Infant Mortality,..
NBER working paper series, no. w31379
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8
The Impact of Lead Exposure on Fertility, Infant Mortality,..
NBER working paper series, no. w31379
?
9
Designing Difference in Difference Studies With Staggered T..
NBER working paper series, no. w31842
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10
The Gift of a Lifetime: The Hospital, Modern Medicine, and ..
NBER working paper series, no. w30663