Papercrete is a material made by pulping used paper. Papercrete almost always contains various additives (commonly sand and cement) and is formed or molded to a useable shape. After allowing it to dry for a few weeks, a lightweight and versatile building material results. To gain free access to everything papercreters has to offer, including the abilty to post your own messages, a recipe database, photos, videos, and more, please visit: http://groups.yahoo.com/group/papercreters/
I am guessing it is because people that are not members of this group can read all group messages without joining the group.
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