Where can I download labs and examples for previous editions?

Is there a way to download code/graphics/etc for previous editions of books? I recently (3 weeks ago) picked up Head First C# 2nd edition, but now when I go to dl the files to use it, I'm only finding files for the 3rd edition (just released a few days ago, I believe). Unfortunately the examples are not all the same. In the very first chapter I'm asked to DL something that no longer is available at the link in the book.
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