Alberta_tar_sands

By Unknown - http://collectionscanada.gc.ca/ourl/res.php?url_ver=Z39.88-2004&url_tim=2014-06-25T15%3A39%3A41Z&url_ctx_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Actx&rft_dat=3592868&rfr_id=info%3Asid%2Fcollectionscanada.gc.ca%3Apam&lang=eng MIKAN no. 3592868, Public Domain, https://commons.wikimedia.org/w/index.php?curid=4928941

Athabasca oil sands on the banks of the river, c. 1900 Photo: Collections Canada