By Hills L.V.   Harington C.R.   in Quaternary Science Reviews

ISSN:0277-3791|22|14|1521-1523

Elsevier‎(2003)‎

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By Strong W.L   Hills L.V.   in Canadian Journal of Botony

ISSN:1480-3305|84|7|1129-1141

NRC Research Press‎(2006)‎

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