Example: tourism industry
Weld Imperfections and Preventive Measures
(4) Overseas Vocational Training Association, "Arc Welding," 1985 (5) American Welding Society, "Welding Handbook," 8th Edition, Vol. 1, 1987 (6) American Welding Society, "Jefferson's Welding Encyclopedia," 18th Edition, 1997 (7) American Welding Society, "Weld and Base Metal Discontinuities," 1986
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