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Has anyone taken Purdue's online animal nutrition class? I just enrolled and I'm looking at getting a textbook on Amazon. The Fifth edition is about $65, whereas I can get a 4th Edition for $10...but it's from 1995! Has anyone used an older text, and is there any reason I should get the newer text? The syllabus says an older text is acceptable, but a 16 yr-old text just seems a bit outdated. I'd love to save $55, but I don't want to end up with an inferior textbook. Any thoughts?