TY - BOOK AU - Thygerson, Alton L. TI - Essentials of safety SN - 0132878631 U1 - 363.1 PY - 1986/// CY - Englewood Cliffs, N.J. PB - Addison-Wesley KW - Accidents KW - United States KW - Prevention KW - Safety education N1 - 001824; S 068 ER -