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[edited by] Robert E. Lenga, Kristine L. Votoupal
Sigma-Aldrich Co. c1993
v. 1 , v. 2 , v. 3
Available at 10 libraries
[edited by] Robert E. Lenga
Sigma-Aldrich Corp. c1988 Ed. 2
v. 1: A-L , v. 2: M-Z & Indices
Available at 35 libraries
Robert E. Lenga
Sigma-Aldrich Corp. c1985
Available at 18 libraries
