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1
Lenk, John D, 568.86-L566l | McGraw-Hill Book Company | 1990 568.86-L566l,
2
Lenk, John D., 555.84-L556a | McGraw-Hill | 1991 555.84-L556a,
3
Lenk, John D., 555.84-L566l | McGraw-Hill | 555.84-L566l,