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The saponification value of linolenic acid is approximately 190 mg KOH/g. This value can be found in various chemistry reference books and online databases specializing in fatty acid properties. For instance, you could search for "linolenic acid saponification value" on scientific databases like PubChem or NIST Chemistry WebBook. You may also find this information in textbooks like "Chemistry: The Central Science" or "Organic Chemistry" by Paula Yurkanis Bruice.