00243nam a2200109Ia 4500008004100000041000800041082002600049100001400075245002700089260000900116300000800125211209s1977    xx            000 0 und d  aeng  a550.246 2 N77 BLY/DEF  aBLYTH G H  aGEOLOGY FOR ENGINEERS   c1977  a557