User:Lilafromthepack/TWA/Earth
Gnawledge, O'penn. "Planet Earth in the Balance of History". Science and Nature Journal. SandNjournal.com/Earthinthebalance. March 21, 2013. Retrieved 18:24, Thursday March 20, 2014 (UTC).
Gnawledge, O'penn. "Planet Earth in the Balance of History". Science and Nature Journal. SandNjournal.com/Earthinthebalance. March 21, 2013. Retrieved 18:24, Thursday March 20, 2014 (UTC).