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*1001 $aSinai, Todd$0(NO-TrBIB)3021124$_16063800
*24510$aGeography and the Internet :$bis the Internet a substitute or a complement for cities?$cTodd Sinai, Joel Waldfogel
*260  $aCambridge, Mass.$bNational Bureau of Economic Research$c2003
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*4901 $aWorking paper series / National Bureau of Economic Research$v10028
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