Those pages due to the nature of searching for them are the exact same same pages as your normal content just that the url has changed . The best way in my opinion to address this is by using the canonical element you can read more here . if your normal pages have the element embedded in the code any instance of duplicate content should not be an issue.

Hope this helps

I am glad I was able to help and I am sure you'll do great with the long tails especially if the niche is not highly competitive. Hit me up in a few months would love to hear you did well.

Moving it in a sub folder in your main site will be more beneficial . Speaking from experience we've seen the sites we've worked with gain a relevant amount of long tail traffic when we implemented this strategy.

Subdomains DO NOT always inherit all of the positive metrics and ranking ability of other subdomains on a given root domain. If a major motivation of the blog is to pass juice then definitely build it in a sub folder.

I forget the link to the study but Post-Panda some webmasters actually resorted to moving content to subdomains as a work around to their content woes providing further proof that sub domains provide a buffer from negative or positive metrics of the root domain.

In summation I really feel it is the intent of the blog that you should consider when making this determination but in your situation I would suggest following your current direction , More info here for further reading .

Hope this helps ... Cheers Mate

Moving it in a sub folder in your main site will be more beneficial . Speaking from experience we've seen the sites we've worked with gain a relevant amount of long tail traffic when we implemented this strategy.

Subdomains DO NOT always inherit all of the positive metrics and ranking ability of other subdomains on a given root domain. If a major motivation of the blog is to pass juice then definitely build it in a sub folder.

I forget the link to the study but Post-Panda some webmasters actually resorted to moving content to subdomains as a work around to their content woes providing further proof that sub domains provide a buffer from negative or positive metrics of the root domain.

In summation I really feel it is the intent of the blog that you should consider when making this determination but in your situation I would suggest following your current direction , More info here for further reading .

Hope this helps ... Cheers Mate