| http://www.w3.org/ns/prov#value | - Eco-Libris celebrates the 41st Annual Earth Day with a new campaign, where we ask readers to tell us why planting a tree for their book is a good idea.With more than 180,000 trees planted so far on behalf of readers, authors and publishers working with Eco-Libris, it is no surprise that we think planting trees to green up books is a great idea..
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