Columbia subject headings:
Civilization, Medieval.
Forests and forestry--Europe--History.
Plants and civilization.
Harvard subject headings:
Apples--History.
Civilization, Medieval
Plants and civilization.
Trees in art.
Trees in literature.
Trees--Europe--History.
Trees--Folklore.
Trees--Mythology.
Trees--Nomenclature (Popular)
Trees--Religious aspects.
Princeton subject headings:
Civilization, Medieval.
Forests and forestry--Europe--History.
Plants and civilization.