Mike, Make sure when using Search to put the right dates in the "newer than" and "older than" boxes. If you get no hits, that's usually the reason.

I typed in cotton (no quote marks) and newer than 3 years and got lots of hits. I usally don't bother with the older than box unless I know I'm looking for something in particular and have a vague idea when it was posted.
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Don't get me started, you know how I get.