KHANNA O P, . (1994). A TEXT BOOK OF WELDING TECHNOLOGY. : DHANPAT RAI & SONS.
KHANNA O P, . 1994. A TEXT BOOK OF WELDING TECHNOLOGY. : DHANPAT RAI & SONS.
KHANNA O P, . A TEXT BOOK OF WELDING TECHNOLOGY. : DHANPAT RAI & SONS. 1994.