Vale, T. R. (1982). Plants and people: Vegetation change in North America. Washington, D.C: Association of American Geographers.
Παραπομπή Chicago StyleVale, Thomas R. Plants and People: Vegetation Change in North America. Washington, D.C: Association of American Geographers, 1982.
Παραπομπή MLAVale, Thomas R. Plants and People: Vegetation Change in North America. Washington, D.C: Association of American Geographers, 1982.
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