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Ballard Stanley S, Hausmann Erich & Slack Edgar P. (1954). Physics principles. : .
Ballard Stanley S, Hausmann Erich and Slack Edgar P. 1954. Physics principles. : .
Ballard Stanley S, Hausmann Erich and Slack Edgar P. (1954). Physics principles. : .
Ballard Stanley S, Hausmann Erich and Slack Edgar P. Physics principles. : . 1954.