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by Hougen, Olaf A. (Olaf Andreas), 1893- | Watson, Kenneth Merle, 1903- [joint author.] | Hougen, Olaf A. (Olaf Andreas), 1893-. Chemical process principles.
by Hougen, Olaf A. (Olaf Andreas), 1893- | Watson, Kenneth Merle, 1903- [joint author.].