PIEL J., . (1973). MAN AND HIS TECHNOLOGY PROBLEMS AND ISSUES. : MC GRAW HILL.
PIEL J.G, . 1973. MAN AND HIS TECHNOLOGY PROBLEMS AND ISSUES. : MC GRAW HILL.
PIEL J.G, . MAN AND HIS TECHNOLOGY PROBLEMS AND ISSUES. : MC GRAW HILL. 1973.
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