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200 1 $aWhat happens during business cycles$dA progress report
210   $aNew York$cNational Bureau of Economic Research$d1951
215   $aXXXI, 386 p.$d24 cm
225 1 $aStudies in business cycles$fNational bureau of economic research$v5
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700  1$aMitchell,$bWesley Clair$f<1874-1948>$0125162
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