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International Engineering Company, Inc. (IECO) was a subsidiary of Morrison-Knudsen. See "Morrison-Knudsen Company, Inc". Baker Library, Harvard Business School. Archived from the original on 2015-03-19. Retrieved 2014-09-28.
International Engineering Company, Inc. (IECO) was a subsidiary of Morrison-Knudsen. See "Morrison-Knudsen Company, Inc". Baker Library, Harvard Business School. Archived from the original on 2015-03-19. Retrieved 2014-09-28.