Amateur Archives is a subreddit that basically serves as a location for people to store, catalog and request amateur porn that has been shared around on the Internet. It has a few basic rules about content that cannot be submitted (such as that containing names, locations, etc.) but it seems pretty free apart from that. Ultimately, the main purpose of /r/AmateurArchives is to help you find a girl that you've been hunting for a while. The users are friendly, capable of doing some great work and really hit the nail on the head when it comes to getting you the material you want.
It's a bit of a group effort, so think of Amateur Archives as being more of a place where you can help as well as be helped. It's perfect for sourcing amateur porn, but that's only because others give up their time in order to assist. 'Today you, tomorrow me' reigns true here, so head on over now and see whether or not you can identify these sexy amateur girls.