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1.
Nitrogenous Acid Derivatives of Ethyl Malonate (Classic Reprint) by Kostalek, John Anton ISBN: 9780331047042 List Price: $9.57
2.
Nitrogenous Acid Derivatives of Ethyl Malonate (Classic Reprint) by Kostalek, John Anton ISBN: 9780331312300 List Price: $25.03