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1
Intergenerational Mobility in Education: Variation in Geogr..
NBER working paper series, no. w25324
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2
Yearbook of the United States Department of Agriculture, 19..
United States congressional serial set ; serial set no. 7190;House document / 64th Congress, 2nd session. House ; no. 1487
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3
Ties that bind the Americas. An address delivered in respon..
United States congressional serial set ; serial set no. 6953;Senate document / 64th Congress, 1st session. Senate ; no. 479