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Experienced backend dev, but SEO newbie here 🙂 When SEOmoz crawls my site, I get notified of DPC errors on some list/archive sorted pages (appending ?sort=X to the url). The pages all have rel=canonical to the archive home. Some of the pages are shorter (have only one or two entries). Is there a way to resolve this error?  Perhaps add rel=nofollow to the sorting menu? Or perhaps find a method that utilizes a non-link navigation method to sort / switch sorted pages? No issues with duplicate content are showing up on google webmaster tools. Thanks for your help!