During this period the American people were undergoing great economic and social reforms brought on by the economic and financial collapse of the 1930's. 1956, Harry S. Truman, chapter 19, in Memoirs of Harry S. Truman: Years of Trial And Hope, volume II, Doubleday & Company, →OCLC, page 274:
Supported by the rich supply of iron ore and coal from the neighboring towns of Tayeh and Huangshih, a major industrial complex had grown up by the 1930’s. 1969, John Gardner, “Urban Bureaucratic Elite in Communist China”, in A. Doak Barnett, editor, Chinese Communist Politics in Action, University of Washington Press, →LCCN, →OCLC, page 221: