Oak tree, winter landscape, Germany --- Image by © Frank Lukasseck/Corbis
Detached oak with bench on a meadowin the fall --- Image by © Dietrich Rose/Corbis
Beech tree and meadow in spring --- Image by © Gerolf Kalt/Corbis
Country road and tree, spring --- Image by © Herbert Kehrer/Corbis
Tree, spring --- Image by © Gerolf Kalt/Corbis
One of a series of four images showing the change of seasons. See images 42-15310916, 42-15310591, 42-15307613, 42-15307570. --- Image by © Gerolf Kalt/Corbis
Apple tree in winter --- Image by © Gerolf Kalt/Corbis
Plowed field with two apple trees in the autumn --- Image by © Herbert Kehrer/Corbis
Country road and tree, autumn, morning --- Image by © Gerolf Kalt/Corbis
A single birch tree seen through the four seasons. The four photos in the series are 42-17364558, 42-17364248, 42-15310932, 42-15306284. --- Image by © Gerolf Kalt/Corbis
Death Valley National Park, USA --- Trees and sand dunes with mountains behind --- Image by © Gerolf Kalt/Corbis
Oak in mist --- Image by © Frank Krahmer/Corbis
Oak tree in meadow, spring --- Image by © Gerolf Kalt/Corbis
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Baden-Württemberg, Germany --- Tree and sunrise --- Image by © Herbert Kehrer/Corbis
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Pear Tree in Summer --- Image by © Gerolf Kalt/Corbis
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One of a series of four images showing the change of seasons. See images 42-17364071 42-17364072, 42-17364164, 42-17364165. --- Image by © Gerolf Kalt/Corbis
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Cherry Tree --- Image by © Gerolf Kalt/Corbis
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Pear Tree --- Image by © Gerolf Kalt/Corbis
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Blossoming Apple Tree --- Image by © Gerolf Kalt/Corbis
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Altmuhltal Nature Park, Germany --- European Beech Tree --- Image by © Gerolf Kalt/Corbis
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Single Tree in Dandelion Meadow --- Image by © Gerolf Kalt/Corbis
Oak tree on field --- Image by © Frank Lukasseck/Corbis
Oak tree, Hesse, Germany, autumn --- Image by © Dietrich Rose/Corbis
Pear tree in spring --- Image by © Gerolf Kalt/Corbis
Apple tree, summer --- Image by © Gerolf Kalt/Corbis
Beech tree in springtime --- Image by © Gerolf Kalt/Corbis
Ploughed field, autumn, at dusk --- Image by © Herbert Kehrer/Corbis
Beech tree, spring --- Image by © Gerolf Kalt/Corbis
Apple Tree on Hill --- Image by © Gerolf Kalt/Corbis
Apple tree, autumn --- Image by © Gerolf Kalt/Corbis
Tree and forest meadow, at dawn --- Image by © Claudius/Corbis
Oak tree in meadow at sunset --- Image by © Gerolf Kalt/Corbis
Solitary oak-tree in a flower meadow --- Image by © Gerolf Kalt/Corbis
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Icy Oak Tree Against Bright Blue Sky --- Image by © Gerolf Kalt/Corbis
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Austria --- Trees in snowscape, winter --- Image by © Roland Gerth/Corbis
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Cherry Tree in Winter --- Image by © Gerolf Kalt/Corbis
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Blossoming Cherry Tree --- Image by © Gerolf Kalt/Corbis
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Oak Tree and Birch Tree in Coniferous Forest --- Image by © Gerolf Kalt/Corbis
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Beech Tree in Coniferous Forest --- Image by © Gerolf Kalt/Corbis