00253nam a2200109Ia 450000500170000008000190001710000230003624500180005926000340007730000150011158300170012620260716043551.0  a12.04.01 M1572  aMackenzie, R. Alec  aThe time trap  bMcGraw-HillaNew YorkUSc1975  axi, 195 p.  c2/3/05kJOYD