00256nam a2200109Ia 4500082002100000245005600021260002500077500000500102700000500107100001700112300001700129  a338.973bB967.PT  aProduction trends in the United States since 1870b  aNew YorkbNBERc1934  a  a  aBurns, A. F.  axxxii, 363p.