1.

図書
図書
1. Safety. 2nd ed
Alton L. Thygerson
出版情報: Boston : Jones and Bartlett Publishers, c1992
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2.

図書
図書
2. Safety education : man, his machines, and his environment
W. Wayne Worick
出版情報: Englewood Cliffs, N.J. : Prentice Hall, [1975]
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