Biblio
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2013. .
2014. .
2012. .
2009. .
2012. .
2011. .
2014. .
2016. .
2016. .
2004.
Measuring Student Knowledge of Landscapes and Their Formation Timespans. National Association of Geoscience Teachers.
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2013. .
2017. .
2007. .
2012. .
2003. .
Submitted. .
2012. .
2012. .
2012. .
2014. .
2014. .
2008. .
2008. .
2007. .
2006.