Lafortune, Jeanne People and machines : A Look at the evolving relationship between capital and skill in manufacturing 1860-1930 using immigration shocks / Jeanne Lafortune, Jose Tessada and Ethan Lewis - Cambridge NBER 2015 - 95p - NBER Working Paper ; 21435 . Subjects--Topical Terms: NBERWP 21435E15241.pdf