00879nam a2200241Ia 450000100060000000300050000600500170001100800410002801000150006902000150008404300120009905000230011108200250013410000320015924501130019126000390030430000240034349000540036750000610042150400300048265000590051265000660057139979BIBL20160527200225.0750310c19751967nyu      bs   00010 eng    a 75002601   a0405072228  an-us-pa0 aHD9517.P4bW3 1975  a338.4/566/914130974810aWalsh, William David2Local14aThe diffusion of technological change in the Pennsylvania pig iron industry, 1850-1870cWilliam David Walsh.0 aNew YorkbArno Pressc1975, c1967.  axxi, 256 p.c24 cm. 0aDissertations in American economic history2Local  aOriginally presented as the author's thesis, Yale, 1967.  aBibliography: p. 251-256. 0aIron industry and TradezPennsylvaniaxHistory.2Local 0aTechnological innovationszPennsylvaniaxCase studies.2Local