作者 | Don Jackson Kinsey / E.I. du Pont de Nemours & Company. Grasselli Chemical Department / Frank Nicolai Moerk / James Ritchie / Leale, G. W., Company, San Francisco / M. Heath / Metropolitan Super-Highway Association of DuPage, Cook and Kane Counties, Chicago / Québec (Québec) / United States. Mississippi River Commission / United States. War Department / Yellow Pine Manufacturers' Association |